Firefox Changelog

What's new in Firefox 125.0.2

Apr 23, 2024

Fixed:
Reverted the changes recently shipped in Firefox 125 that more proactively blocked downloads from potentially untrustworthy URLs. The changes caused unexpected problems with downloading files in some situations. We plan to fix and re-enable these protections in a future release. (Bug 1892069)
Unresolved:
When attempting to launch Firefox while it is already running, an extra blank tab with an address of https://0.0.0.1 may sometimes appear. The cause of this has been identified and will be resolved in an upcoming release.

New in Firefox 125.0.1 (Apr 17, 2024)

New:
Firefox now supports the AV1 codec for Encrypted Media Extensions (EME), enabling higher-quality playback from video streaming providers.
The Firefox PDF viewer now supports text highlighting.
Firefox View now displays pinned tabs in the Open tabs section. Tab indicators have also been added to Open tabs, so users can do things like see which tabs are playing media and quickly mute or unmute across windows. Indicators were also added for bookmarks, tabs with notifications, and more!
Firefox now prompts users in the US and Canada to save their addresses upon submitting an address form, allowing Firefox to autofill stored address information in the future.
Firefox now more proactively blocks downloads from URLs that are considered to be potentially untrustworthy.
The URL Paste Suggestion feature provides a convenient way for users to quickly visit URLs copied to the clipboard in the address bar of Firefox. When the clipboard contains a URL and the URL bar is focused, an autocomplete result appears automatically. Activating the clipboard suggestion will navigate the user to the URL with 1 click.
Users of tab-specific Container add-ons can now search in the Address Bar for tabs that are open in different containers. Special thanks to volunteer contributor atararx for kicking off the work on this feature!
Firefox now provides an option to enable Web Proxy Auto-Discovery (WPAD) while configured to use system proxy settings.
Fixed:
CVE-2024-3852: GetBoundName in the JIT returned the wrong object
CVE-2024-3853: Use-after-free if garbage collection runs during realm initialization
CVE-2024-3854: Out-of-bounds-read after mis-optimized switch statement
CVE-2024-3855: Incorrect JIT optimization of MSubstr leads to out-of-bounds reads
CVE-2024-3856: Use-after-free in WASM garbage collection
CVE-2024-3857: Incorrect JITting of arguments led to use-after-free during garbage collection
CVE-2024-3858: Corrupt pointer dereference in js::CheckTracedThing<js::Shape>
CVE-2024-3859: Integer-overflow led to out-of-bounds-read in the OpenType sanitizer
CVE-2024-3860: Crash when tracing empty shape lists
CVE-2024-3861: Potential use-after-free due to AlignedBuffer self-move
CVE-2024-3862: Potential use of uninitialized memory in MarkStack assignment operator on self-assignment
CVE-2024-3863: Download Protections were bypassed by .xrm-ms files on Windows
CVE-2024-3302: Denial of Service using HTTP/2 CONTINUATION frames
CVE-2024-3864: Memory safety bug fixed in Firefox 125, Firefox ESR 115.10, and Thunderbird 115.10
CVE-2024-3865: Memory safety bugs fixed in Firefox 125
Changed:
In a group of radio buttons where no option is selected, the tab key now only reaches the first option rather than cycling through all available options. The arrow keys navigate between options as they do when there is a selected option. This makes keyboard navigation more efficient and consistent.
Enterprise:
Bug Fixes:
Setting the policy for DefaultDownloadDirectory incorrectly locked the download directory selector in preferences. (DownloadDirectory should be used if you want the preference locked.) This was fixed in bug 1885362.
Firefox now provides an option to enable Web Proxy Auto-Discovery (WPAD) when configured to use system proxy settings. This was added in bug 621429.
Policies:
Policies for AutofillAddressEnabled and AutofillCreditCardEnabled have been added.
Developer:
Following several requests, we have reintroduced the option to disable the Pause Debugger Overlay (devtools.debugger.features.overlay). This overlay appears over the page content when the debugger pauses JavaScript execution. In certain scenarios, the overlay can be intrusive, making it challenging to interact with the page, for instance, evaluating shades of color underneath.
We've added a new drop-down menu button at the bottom of the source view in the Debugger panel, specifically designed for Source Map related actions. Users can now easily disable or enable Source Maps support, open the Source Map file in a new tab, switch between the original source and the generated bundle, toggle the "open original source by default" option, and view the Source Map status such as errors, loading status, etc.
Web Platform:
Web Platform
Firefox now supports the popover global attribute used for designating an element as a popover element. The element won't be rendered until it is made visible, after which it will appear on top of other page content.
WebAssembly multi-memory is now enabled by default. Wasm multi-memory allows wasm modules to use and import multiple independent linear memories. This enables more efficient interoperability between modules and provides better polyfills for upcoming wasm standards, such as the component model.
Added support for Unicode Text Segmentation to JavaScript.
Added support for contextlost and contextrestored events on HTMLCanvasElement and OffscreenCanvas to allow user code to recover from context loss with hardware accelerated 2d canvas.
Firefox now supports the navigator.clipboard.readText() web API. A paste context menu will appear for the user to confirm when attempting to read clipboard data not provided by the same-origin page.
Added support for the content-box and stroke-box keywords of the transform-box CSS property.
The align-content property now works in block layout, allowing block direction alignment without needing a flex or grid container.
Support for SVGAElement.text was removed in favor of the more widely-implemented SVGAElement.textContent method.

New in Firefox 124.0.2 (Apr 3, 2024)

New in Firefox 124.0.1 (Apr 2, 2024)

New in Firefox 125.0b6 Beta (Mar 29, 2024)

New in Firefox 124.0 (Mar 20, 2024)

New:
Caret browsing mode now also works in the PDF viewer. (Learn more)
In Firefox View, open tabs can now be sorted by either recent activity or tab order. Recent activity is the default setting.
Firefox now populates the Windows taskbar jump list more efficiently, which should allow for a smoother overall browsing experience.
Firefox on Mac now uses the macOS fullscreen API for all types of fullscreen windows. This should better match the expected macOS user experience for fullscreen spaces, menubar and the Dock.
As of Firefox 124, Qwant's availability has been expanded to all languages in the France region along with Belgium, Italy, Netherlands, Spain, and Switzerland.
Fixed:
CVE-2024-2605: Windows Error Reporter could be used as a Sandbox escape vector
CVE-2024-2606: Mishandling of WASM register values
CVE-2024-2607: JIT code failed to save return registers on Armv7-A
CVE-2024-2608: Integer overflow could have led to out of bounds write
CVE-2023-5388: NSS susceptible to timing attack against RSA decryption
CVE-2024-2609: Permission prompt input delay could expire when not in focus
CVE-2024-2610: Improper handling of html and body tags enabled CSP nonce leakage
CVE-2024-2611: Clickjacking vulnerability could have led to a user accidentally granting permissions
CVE-2024-2612: Self referencing object could have potentially led to a use-after-free
CVE-2024-2613: Improper handling of QUIC ACK frame data could have led to OOM
CVE-2024-2614: Memory safety bugs fixed in Firefox 124, Firefox ESR 115.9, and Thunderbird 115.9
CVE-2024-2615: Memory safety bugs fixed in Firefox 124
Enterprise:
Policies:
The DNSOverHTTPS policy has been updated to support setting a Fallback value to prevent falling back to your default DNS Provider. This does not apply to the ESR.
The AllowFileSelectionDialogs policy has been added for controlling file selection dialogs. This policy is not available on the ESR.
Developer:
CSS:
The content-visibility CSS property value auto is now enabled by default. This allows content to skip rendering if it is not relevant to the user. (Firefox bug 1874874).
The text-wrap property has now been converted to a shorthand property and covers the constituent properties text-wrap-mode and text-wrap-style. (Firefox bug 1758391).
SVG:
The ::first-letter and ::first-line CSS pseudo-elements can now be applied to the <text> SVG element. This allows you to change the fill, stroke or font of the first letter/line of a <text> element using CSS, for example. (Firefox bug 1302722).
APIs:
AbortSignal.any() is now supported, allowing a composite signal to be created that can be used to abort an operation from multiple signal sources. (Firefox bug 1830781).
WebDriver conformance (WebDriver BiDi, Marionette):
WebDriver BiDi:
Implemented the storage.getCookies command, which allows users to retrieve cookies. This command accepts two optional arguments. Clients can provide the filter argument to only return cookies matching specific criterias. And the partition argument can be used to build the partition key and retrieve cookies owned by the corresponding partition. (Firefox bug 1854580)
Implemented the storage.setCookie command, which creates a new cookie. Users can provide information about the cookie in the cookie parameter, and optionally a partition parameter to build the partition key of the partition which should own the cookie. (Firefox bug 1854582)
Implemented various commands to intercept requests:
network.addIntercept which allows users to define URL patterns which will be used to intercept network requests during various phases of a network event lifecycle. This command returns the unique id generated for the created network intercept. (Firefox bug 1826192)
network.removeIntercept allows to remove intercepts based on their unique id. (Firefox bug 1826193)
network.continueWithAuth allows to resume requests intercepted in the AuthRequired phase. Using the "action" argument, clients can either "cancel", "provideCredentials" with username and password, or fallback to "default" to let the browser display the authentication prompt.(Firefox bug 1826196)
network.failRequest allows to cancel requests intercepted in the BeforeRequestSent or the ResponseStarted phases.(Firefox bug 1853883)
network.continueRequest, network.continueResponse and network.provideResponse are also available, but at the moment they only support the "request" argument and will only allow to resume a blocked request. In future releases, additional arguments will allow to modify the request and response. (Firefox bug 1874206 and Firefox bug 1853882)
Implemented several commands around "user contexts", implemented as containers in Firefox:
browser.createUserContext creates a new user context and returns the unique id of the new user context. (Firefox bug 1870848)
browser.removeUserContext can be used to remove any non-default user context, by specifying its unique id. (Firefox bug 1870849)
browser.getUserContexts allows clients to retrieve the list of all available user contexts, including the default user context. (Firefox bug 1870847)
Added support for the "userContext" argument to the browsingContext.create command, which allows to assign a new browsing context (tab or window) to a specific user context (Firefox container). (Firefox bug 1874918)
Updated the browsingContext.Info type to include the "userContext" field, which is the unique id of the user context owning the tab for this browsing context. (Firefox bug 1874920)
Added support for the "contexts" argument to the script.addPreloadScript command, this allows clients to add preload scripts only to specific browsing context trees (tabs) by specifying their top-level browsing context. (Firefox bug 1858458)
Fixed a bug where browsingContext.close would not be able to close the last tab of a window. (Firefox bug 1873948)
Marionette:
Fixed an issue with Get Element Text, which ignored the slot value of a web component when no custom text is specified. (Firefox bug 1865381)
Changes for add-on developers:
Adds the runtime.onPerformanceWarning event that enables extensions to obtain information when the browser detects that the extension has a runtime performance issue such as a slow-running content script (Firefox bug 1861445).
Experimental web features:
These features are newly shipped in Firefox 124 but are disabled by default. To experiment with them, search for the appropriate preference on the about:config page and set it to true. You can find more such features on the Experimental features page.
Growable SharedArrayBuffer: javascript.options.experimental.sharedarraybuffer_growable. The SharedArrayBuffer is now growable using the SharedArrayBuffer.prototype.grow() method. The maximum allowed size of the buffer is specified using the options.maxByteLength parameter to the SharedArrayBuffer() constructor. The SharedArrayBuffer.prototype.growable and SharedArrayBuffer.prototype.maxByteLength properties indicate whether the buffer can be grow, and its maximum allowed size, respectively. (Firefox bug 1842773.)
Resizable ArrayBuffer: javascript.options.experimental.arraybuffer_resizable. The ArrayBuffer can now be resized using the ArrayBuffer.prototype.resize() method. The maximum allowed size of the buffer is specified using the options.maxByteLength parameter to the ArrayBuffer() constructor. The ArrayBuffer.prototype.resizable and ArrayBuffer.prototype.maxByteLength properties indicate whether the buffer can be resized, and its maximum allowed size, respectively. (Firefox bug 1842773.)
Web Platform:
Added support for AbortSignal.any.
You can now use HTTP(S) and relative URLs when creating WebSockets.

New in Firefox 123.0.1 (Mar 5, 2024)

New in Firefox 123.0 (Feb 21, 2024)

New:
We’ve integrated search into Firefox View. You can now search through all of the tabs on each of the section subpages - Recent Browsing, Open Tabs, Recently Closed Tabs, Tabs from other devices, or History.
Having any issues with a website on Firefox, yet the site seems to be working as expected on another browser? You can now let us know via the Web Compatibility Reporting Tool! By filing a web compatibility issue, you’re directly helping us detect, target, and fix the most impacted sites to make your browsing experience on Firefox smoother.
Fixed:
When translating web pages, we are now also translating text in tooltips (i.e. titles) and text displayed in form controls (i.e. placeholder).
Various security fixes:
CVE-2024-1546: Out-of-bounds memory read in networking channels
CVE-2024-1547: Alert dialog could have been spoofed on another site
CVE-2024-1554: fetch could be used to effect cache poisoning
CVE-2024-1548: Fullscreen Notification could have been hidden by select element
CVE-2024-1549: Custom cursor could obscure the permission dialog
CVE-2024-1550: Mouse cursor re-positioned unexpectedly could have led to unintended permission grants
CVE-2024-1551: Multipart HTTP Responses would accept the Set-Cookie header in response parts
CVE-2024-1555: SameSite cookies were not properly respected when opening a website from an external browser
CVE-2024-1556: Invalid memory access in the built-in profiler
CVE-2024-1552: Incorrect code generation on 32-bit ARM devices
CVE-2024-1553: Memory safety bugs fixed in Firefox 123, Firefox ESR 115.8, and Thunderbird 115.8
CVE-2024-1557: Memory safety bugs fixed in Firefox 123
Changed:
Address bar settings can now be found in the Firefox Settings' Search section.
Improved PGO optimizations for macOS ARM64 and Android
Off-main-thread canvas on macOS, Linux and Android
Enterprise:
Bug Fixes:
The background updater now updates properly when there are multiple user accounts on a system. This was fixed in bug 1830071. (This only applies to Firefox 123.)
Policies:
The Preferences policy has been updated to allow explicitly setting the type of preference using Type. This works around a problem where setting an integer preference with a value of 0 or 1 would end up as a boolean. This was done in bug 1872267.
The UserMessaging policy has been updated so that FeatureRecommendations also controls whether or not the translation feature is advertised in a popup. This was done in bug 1855314.
Developer:
The Network Monitor now supports saving a response body to disk through the Save Response As context menu item. This replaces the Save Image context menu item, which only supported saving images.
Web Platform:
We now implement linearRGB interpolation for SVG gradients, as well as the existing sRGB interpolation. You can choose which to use via the color-interpolation property.
Previously, SVG feImage elements that pointed to SVG content required the SVG document to have a root element that had non-percentage width and height values. Such content will now fall back to use the default replaced element values of 300px width and 150px height and the feImage will no longer fail to render.
By enabling Preload and Modulepreload support, Early Hints are now fully supported.
Audio echo cancellation can now be applied to microphone inputs when the audio output is redirected to another device with setSinkId().
Firefox now supports declarative ShadowDOM, providing developers greater flexibility and improved ergonomics when working with ShadowDOMs directly within HTML.
Unresolved:
Some machines with older AMD CPUs may see image thumbnails incorrectly render as all black in file dialogs. If this is the case, updating the graphics driver should address this issue.
Community Contributions:
With the release of Firefox 123, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 9 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Aaron: 1221964
Eliot Jacobs: 1843720, 1860845, 1867908
[email protected]: 1806693
Jon Parise: 1872505
Jordan Petridis: 1871863
Kaiido: 1872237
Kate Galich: 1867610
Redfire: 1872151, 1873317
toe_head2001: 1872457

New in Firefox 123.0b2 Beta 2 (Jan 24, 2024)

New in Firefox 122.0 (Jan 22, 2024)

New in Firefox 122.0b1 Beta 1 (Dec 19, 2023)

New:
Firefox now prompts Windows users to install the Microsoft AV1 Extension to enable hardware decoding support from about:support if not already installed.
Firefox now supports Voice Control commands on macOS systems.
Firefox now allows you to force-underline links in websites. This is useful for people with achromatopsia for example.
On Linux, Firefox now defaults to the Wayland compositor when available instead of XWayland. This brings support for touchpad & touchscreen gestures, swipe-to-nav, per-monitor DPI settings, better graphics performance, and more.
Note that due to Wayland protocol limitations, Picture-in-Picture windows require an extra user interaction (generally right-click on the window) or a shell / desktop-environment tweak. See bug 1621261 for related discussion and tracking, this post for a KDE configuration, and this extension for GNOME.
Firefox now includes a floating button to simplify deleting drawings, text, and images added in PDFs.
Developer:
Developer Information:
The Firefox Debugger now includes a new feature: an option to disable the debugger; keyword on the current page. This feature is accessible via a new checkbox in the Breakpoints side panel, labeled Pause on debugger statement, located next to the existing Pause on exceptions checkbox. By default, this option is enabled, meaning that the debugger statements are active unless manually disabled.
Web Platform:
The CSS text-indent property now supports the hanging and each-line keywords, offering more convenient paragraph layout for styles such as bibliographies, poetry, etc.
Firefox now supports text-wrap: balance, which can improve the appearance of short multi-line text blocks such as long headings or captions by harmonizing the line lengths.
Lazy loading iframes are now supported (<iframe loading=lazy>). Lazy loading iframes are only loaded when visible, so non-critical iframes can load later when needed to speed up initial page loads, reduce initial network usage, etc.
The :has() selector is now supported. This allows authors to match elements that has, or "anchors", at least one element matching its relative selector.
Supprt has been added for tail call elimination in WebAssembly language to improve support for functional languages.

New in Firefox 120.0.1 (Dec 2, 2023)

New in Firefox 121.0b3 Beta (Nov 24, 2023)

Firefox now prompts Windows users to install the Microsoft AV1 Extension to enable hardware decoding support from about:support if not already installed.
Firefox now supports Voice Control commands on macOS systems.
Firefox now allows you to force-underline links in websites. This is useful for people with achromatopsia for example.
On Linux, Firefox now defaults to the Wayland compositor when available instead of XWayland. This brings support for touchpad & touchscreen gestures, swipe-to-nav, per-monitor DPI settings, better graphics performance, and more.
Note that due to Wayland protocol limitations, Picture-in-Picture windows require an extra user interaction (generally right-click on the window) or a shell / desktop-environment tweak. See bug 1621261 for related discussion and tracking, this post for a KDE configuration, and this extension for GNOME.
Firefox now includes a floating button to simplify deleting drawings, text, and images added in PDFs.
The Firefox Debugger now includes a new feature: an option to disable the debugger; keyword on the current page. This feature is accessible via a new checkbox in the Breakpoints side panel, labeled Pause on debugger statement, located next to the existing Pause on exceptions checkbox. By default, this option is enabled, meaning that the debugger statements are active unless manually disabled.
Web Platform:
The CSS text-indent property now supports the hanging and each-line keywords, offering more convenient paragraph layout for styles such as bibliographies, poetry, etc.
Firefox now supports text-wrap: balance, which can improve the appearance of short multi-line text blocks such as long headings or captions by harmonizing the line lengths.
Lazy loading iframes are now supported (<iframe loading=lazy>). Lazy loading iframes are only loaded when visible, so non-critical iframes can load later when needed to speed up initial page loads, reduce initial network usage, etc.
The :has() selector is now supported. This allows authors to match elements that has, or "anchors", at least one element matching its relative selector.
Support has been added for tail call elimination in WebAssembly language to improve support for functional languages.

New in Firefox 120.0 (Nov 23, 2023)

New:
Firefox supports a new “Copy Link Without Site Tracking” feature in the context menu which ensures that copied links no longer contain tracking information.
Firefox now supports a setting (in Preferences → Privacy & Security) to enable Global Privacy Control. With this opt-in feature, Firefox informs the websites that the user doesn’t want their data to be shared or sold. This feature is enabled in private browsing mode by default
Firefox’s private windows and ETP-Strict privacy configuration now enhance the Canvas APIs with Fingerprinting Protection, thereby continuing to protect our users’ online privacy.
Firefox is rolling-out Cookie Banner Blocker by default in private windows for users in Germany during the coming weeks. Firefox will now auto-refuse cookies and dismiss annoying cookie banners for supported sites.
Firefox has enabled URL Tracking Protection by default in private windows for all users in Germany. Firefox will remove non-essential URL query parameters that are often used to track users across the web.
Firefox now imports TLS trust anchors (e.g., certificates) from the operating system root store. This will be enabled by default on Windows, macOS, and Android, and if needed, can be turned off in settings (Preferences → Privacy & Security → Certificates).
Keyboard shortcuts have now been added for editing and deleting a selected credential on about:logins. For editing - Alt + enter (Option + return on macOS) and for deleting - Alt + Backspace (Option + Delete on macOS).
Users on Ubuntu Linux now have the ability to import from Chromium when both are installed as Snap packages.
Picture-in-Picture now supports corner snapping on Windows and Linux - just hold Ctrl as you move the PiP window.
Fixed:
Various security fixes:
CVE-2023-6204: Out-of-bound memory access in WebGL2 blitFramebuffer
CVE-2023-6205: Use-after-free in MessagePort::Entangled
CVE-2023-6206: Clickjacking permission prompts using the fullscreen transition
CVE-2023-6207: Use-after-free in ReadableByteStreamQueueEntry::Buffer
CVE-2023-6208: Using Selection API would copy contents into X11 primary selection.
CVE-2023-6209: Incorrect parsing of relative URLs starting with "///"
CVE-2023-6210: Mixed-content resources not blocked in a javascript: pop-up
CVE-2023-6211: Clickjacking to load insecure pages in HTTPS-only mode
CVE-2023-6212: Memory safety bugs fixed in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5
CVE-2023-6213: Memory safety bugs fixed in Firefox 120
Enterprise:
Policies:
The PrintingEnabled policy has been added to allow printing to be disabled.
The Preferences policy has been updated to allow setting preferences beginning with the prefix pref.. These are primarily used for disabling buttons in preferences and must be locked to function correctly.
Developer:
The User Activation API has now been added, allowing JavaScript to check if the user currently is or has been active with the page (clicking, etc) with navigator.userActivation.
Early Hints Preconnect, the informational status code 103, is now enabled. This allows servers to send resource Link headers before the final HTTP response and improves performance on servers using this feature. (read more)
Users can now use an added devtools feature to simulate browser tabs to be offline.
The Style Editor panel now features a new "Pretty Print" button located in the footer of the panel, similar to the pretty print button found in the Debugger panel. This can be used to format stylesheets (e.g., those that are minified). The previous functionality, where minified files were automatically formatted, has been removed.
The Rules panel within the Inspector panel no longer displays colors in the new CSS Color 4 formats (e.g., OKLCH) as hexadecimal/named colors. This ensures that it matches the original values used.
Web Platform:
lh and rlh units can now be parsed and computed correctly as lengths. This allows authors to specify lengths in terms of the element's (or the root element's) line height.
WebAssembly GC is now enabled by default, which allows new languages, such as Dart or Kotlin, to run on Firefox. This makes it possible for reference cycles between the guest language and host browser to be collected.

New in Firefox 119.0.1 (Nov 20, 2023)

New in Firefox 120.0b4 Beta 4 (Oct 30, 2023)

New:
Keyboard shortcuts have now been added for editing and deleting a selected credential on about:logins. For editing - Alt + enter (Option + return on macOS) and for deleting - Alt + Backspace (Option + Delete on macOS).
Users on Ubuntu Linux now have the ability to import from Chromium when both are installed as Snap packages.
Users can now use an added devtools feature to simulate browser tabs to be offline.
Picture-in-Picture now supports corner snapping on Windows and Linux - just hold Ctrl as you move the PiP window.
By default, Firefox now uses TLS trust anchors (e.g., certificates) added to the operating system by the user or an administrator. This works on Windows, macOS, and Android, and it can be turned off in the "Privacy & Security" section of Firefox settings, under "Certificates".
Firefox now supports a setting (in Preferences → Privacy & Security) to enable Global Privacy Control. With this opt-in feature, Firefox informs the websites that the user doesn’t want their data to be shared or sold.
UI setting for GPC:
Firefox supports a new “Copy Link Without Site Tracking” feature in the context menu which ensures that copied links no longer contain tracking information.
copy site image
Developer:
Developer Information:
The User Activation API has now been added, allowing JavaScript to check if the user currently is or has been active with the page (clicking, etc) with navigator.userActivation.
Early Hints Preconnect, the informational status code 103, is now enabled. This allows servers to send resource Link headers before the final HTTP response and improves performance on servers using this feature. (read more)
Web Platform:
lh and rlh units can now be parsed and computed correctly as lengths. This allows authors to specify lengths in terms of the element's (or the root element's) line height.
WebAssembly GC is now enabled by default, which allows new languages, such as Dart or Kotlin, to run on Firefox. This makes it possible for reference cycles between the guest language and host browser to be collected.

New in Firefox 118.0.2 (Oct 23, 2023)

New in Firefox 119.0b8 Beta 8 (Oct 11, 2023)

New:
Firefox View now includes more content:
You can now see all open tabs from all windows.
If you sync open tabs then you will now see all tabs from other devices.
Browsing history is now listed and you can sort by date or by site.
As before, recently closed tabs are also listed in Firefox View.
If the relevant Windows mouse properties system setting is enabled, the mouse pointer will disappear while typing.
Firefox is now available in the Santali (sat) language.
If you're migrating your data from Chrome, Firefox now offers the ability to import some of your extensions as well.
Media sniffing is now disabled for top-level documents served as type application/octet-stream. Allowing these files to be downloaded instead of attempting playback.
The visibility of fonts to websites has been restricted to system fonts and language pack fonts in ETP strict mode to mitigate font fingerprinting.
As part of total cookie protection, Firefox now supports the partitioning of Blob URLs, this mitigates a potential tracking vector that third party agents could have used to track an individual.
Recently closed tabs now persist between sessions that don't have automatic session restore enabled. Manually restoring a previous session will continue to reopen any previously open tabs or windows.
Firefox now supports editing PDFs by adding images, in addition to adding text and drawing. The ability to add Alt Text is also supported while adding images to a PDF document.
Encrypted Client Hello (ECH) is now available to Firefox users, delivering a more private browsing experience. ECH extends the encryption used in TLS connections to cover more of the handshake and better protect sensitive fields.
Read more about the launch of ECH on Mozilla Distilled.
Fixed:
Fixed an issue causing unexpected jumps in scroll position on Facebook.
Web Platform:
ARIA reflection for simple attributes and default Accessibility Semantics for Custom Elements are now supported. Note that this includes boolean, enum, number, and string attributes, but not attributes that reference other elements.
credentialless is now supported in Cross-Origin-Embedder-Policy.
Grouping of items in an array (and iterables) is now easier by using the methods Object.groupBy() or Map.groupBy().
The CSS attr() function now supports a fallback parameter (e.g. attr(foobar, "Default value")).

New in Firefox 118.0.1 (Oct 10, 2023)

New in Firefox 118.0 (Sep 27, 2023)

NEW:
Automated translation of web content is now available to Firefox users! Unlike cloud-based alternatives, translation is done locally in Firefox, so that the text being translated does not leave your machine.
Web Audio in Firefox now uses the FDLIBM math library on all systems to improve anonymity with Fingerprint Protection.
The visibility of fonts to websites has been restricted to system fonts and language pack fonts to mitigate font fingerprinting in Private Browsing windows.
Video Effects and background blur are now available to Firefox users on Google Meet! (Note: These effects have also been released retroactively to support Firefox versions back to Firefox 115.)
Firefox Suggest users (US-only at this time) will now be able to see browser add-on suggestions right in the address bar based on their keywords.
FIXED:
CVE-2023-5168: Out-of-bounds write in FilterNodeD2D1
CVE-2023-5169: Out-of-bounds write in PathOps
CVE-2023-5170: Memory leak from a privileged process
CVE-2023-5171: Use-after-free in Ion Compiler
CVE-2023-5172: Memory Corruption in Ion Hints
CVE-2023-5173: Out-of-bounds write in HTTP Alternate Services
CVE-2023-5174: Double-free in process spawning on Windows
CVE-2023-5175: Use-after-free of ImageBitmap during process shutdown
CVE-2023-5176: Memory safety bugs fixed in Firefox 118, Firefox ESR 115.3, and Thunderbird 115.3
ENTERPRISE:
Bug Fixes:
If the Firefox Relay preference (signon.firefoxRelay.feature) was locked via policy, it was not disabled in the preferences UI. This was fixed in bug 1844615.
Other Changes:
A new preference has been added (browser.download.force_save_internally_handled_attachments) that forces files whose type is internally handled by Firefox to be downloaded when the value attachment or download of the HTTP header Content-Disposition is specified on the link. For more information, see bug 1811830.
Policies:
The FirefoxSuggest policy has been added to manage Firefox Suggest (US only).
The Preferences policy has been updated to allow setting the preferences security.ssl.require_safe_negotiation and xpinstall.whitelist.required.
Special Notes:
As of this release, Firefox 102 ESR is officially out of support.
DEVELOPER:
Developer Tools:
HTML:
The <search> element is now supported. The <search> element is a group element that serves to contain all the elements used in a search or filtering operation (Firefox bug 1824121).
MathML:
The mathml.legacy_maction_and_semantics_implementations.disabled preference is now removed, which means that the <semantics> and <maction> elements only render the first child element by default (Firefox bug 1788223).
All values of the mathvariant attribute other than normal are now deprecated, as is use with any other element than the <mi> element (Firefox bug 1845461).
Removals:
CSS:
Multiple CSS math functions are now supported: abs(), sign(), round(), mod(), rem(), pow(), sqrt(), hypot(), log(), and exp() (Firefox bug 1814589).
A new keyword from-font in the CSS property font-size-adjust enables picking the desired <font-metric> from the first available font (Firefox bug 1708240).
APIs:
The ⊞ Windows Logo key on Windows and the Command key on macOS now return a value of "Meta" for KeyboardEvent.key, instead of "OS", and KeyboardEvent.code returns MetaLeft/MetaRight instead of OSLeft/OSRight (Firefox bug 1232918).
The RTCRtpTransceiver.currentDirection and RTCRtpTransceiver.direction properties now support the "stopped" value for indicating whether a transceiver has stopped, and should be used instead of the deprecated RTCRtpTransceiver.stopped property (Firefox bug 1568296).
The array returned by RTCPeerConnection.getTransceivers() now omits stopped transcievers. Similarly, RTCPeerConnection.getReceivers() and RTCPeerConnection.getSenders() omit the receivers and senders associated with a stopped transceiver (Firefox bug 1568296).
The TextMetrics.emHeightDescent and TextMetrics.emHeightAscent properties are now supported (Firefox bug 1841692).
CSSStyleRule now inherits from CSSGroupingRule instead of directly from CSSRule, with the result that it additionally implements the property cssRules and the methods deleteRule() and insertRule() (Firefox bug 1846251).
WebAssembly:
Removals:
WebDriver conformance (WebDriver BiDi, Marionette)
General:
Fixed an internal race condition for Android which caused the returned user prompt text to be empty for both WebDriver BiDi and Marionette (Firefox bug 1848167).
Both the WebDriver:PerformActions command in Marionette and the browsingContext.performActions command in WebDriver BiDi failed to correctly scroll for a wheel input source in environments that have a high-resolution display connected (Firefox bug 1849229).
WebDriver BiDi
Added the browsingContext.activate command that allows users to bring the given background tab into foreground (Firefox bug 1841004).
Added the browsingContext.handleUserPrompt command that allows users to accept or dismiss an open user prompt of type alert, confirm, or prompt (Firefox bug 1824197).
Added the browsingContext.userPromptOpened event which is emitted when a user prompt of type alert, confirm, or prompt was opened (Firefox bug 1824224).
Added a type field to the JSON payload that is returned to clients to identify event messages, or the success state of a command, which can be one of success or error (Firefox bug 1844009).
Marionette:
Added support for all the Web Authentication extension commands, which allow users to authenticate themselves by Public Key Credentials (Firefox bug 1846574)
Changes for add-on developers:
Removals:
Support for browser_style in the manifest keys action, options_ui, page_action, and sidebar_action for Manifest V3 extensions has been removed (Firefox bug 1830711). See Browser Styles' Manifest v3 migration for information about transitioning from browser_style in Manifest V3 extensions.

New in Firefox 117.0.1 (Sep 22, 2023)

New in Firefox 117.0 (Aug 29, 2023)

New in Firefox 116.0.3 (Aug 16, 2023)

New in Firefox 116.0.2 (Aug 8, 2023)

New in Firefox 115.0.3 (Jul 28, 2023)

New in Firefox 115.0.2 (Jul 27, 2023)

New in Firefox 115.0 (Jul 5, 2023)

New:
Migrating from another browser? Now you can bring over payment methods you've saved in Chrome-based browsers to Firefox.
Hardware video decoding is now enabled for Intel GPUs on Linux.
The Tab Manager dropdown now features close buttons, so you can close tabs more quickly.
We've refreshed and streamlined the user interface for importing data in from other browsers.
Users without platform support for H264 video decoding can now fallback to Cisco's OpenH264 plugin for playback.
Fixed:
Windows Magnifier now follows the text cursor correctly when the Firefox title bar is visible.
Windows users on low-end/USB wifi drivers and with OS geolocation disabled can now approve geolocation on a case by case basis without causing system-wide network instability.
Various security fixes:
CVE-2023-3482: Block all cookies bypass for localstorage
CVE-2023-37201: Use-after-free in WebRTC certificate generation
CVE-2023-37202: Potential use-after-free from compartment mismatch in SpiderMonkey
CVE-2023-37203: Drag and Drop API may provide access to local system files
CVE-2023-37204: Fullscreen notification obscured via option element
CVE-2023-37205: URL spoofing in address bar using RTL characters
CVE-2023-37206: Insufficient validation of symlinks in the FileSystem API
CVE-2023-37207: Fullscreen notification obscured
CVE-2023-37208: Lack of warning when opening Diagcab files
CVE-2023-37209: Use-after-free in `NotifyOnHistoryReload`
CVE-2023-37210: Full-screen mode exit prevention
CVE-2023-37211: Memory safety bugs fixed in Firefox 115, Firefox ESR 102.13, and Thunderbird 102.13
CVE-2023-37212: Memory safety bugs fixed in Firefox 115
Changed:
Undo and redo are now available in Password fields.
On Linux, middle clicks on the new tab button will now open the xclipboard contents in the new tab. If the xclipboard content is a URL then that URL is opened, any other text is opened with your default search provider.
For users with a Firefox Colorways built-in theme, the theme will be automatically migrated to the same theme hosted on addons.mozilla.org for Firefox profiles that have disabled add-ons auto-updates. This will allow users to keep their Colorways theme when they are later removed from Firefox installer files.
Certain Firefox users may come across a message in the extensions panel indicating that their add-ons are not allowed on the site currently open. We have introduced a new back-end feature to only allow some extensions monitored by Mozilla to run on specific websites for various reasons, including security concerns.
Enterprise:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 115 Release Notes.
Bug Fixes:
If a preference was locked by one policy, it could be accidentally unlocked by another policy. This was fixed in bug 1772503.
Policies:
The UserMessaging policy had the ability to lock preferences, but it was missing from the documentation. This has been added.
The FlashPlugin policy has been removed.
A recent change enabled revealing passwords for password fields via a context menu. If you need to remove this behavior, you can set the preference layout.forms.reveal-password-context-menu.enabled to false using the Preferences policy.
Special Notes:
There are two more planned releases of Firefox 102 ESR, and then it will go out of support on September 26, 2023. Users will then be automatically upgraded to the Firefox 115 ESR.
If you need to prevent upgrades for any reason, you can use the new AppUpdatePin policy.
Developer:
In web development, we rely on third-party libraries which you may not be interested in while debugging. These can be ignored. Ignoring them means that breakpoints will not get hit and they are skipped during stepping.
You can now choose to Hide ignore-listed sources in the Developer Tools source tree (bug).
Ignored sources are also skipped by JavaScript tracing feature (bug).
We have introduced a new option, devtools.f12_enabled, that can be utilized to prevent the accidental use of the F12 key, which opens the DevTools toolbox (bug).
Web Platform:
The builtin editor now behaves similarly to other browsers with contenteditable and designMode when splitting a node, e.g. typing Enter to split a paragraph, and also when joining two nodes, e.g. typing Backspace at the start of a paragraph to join the paragraph and the previous one.
When a node is split, the builtin editor creates a new node after the original one instead of before, i.e. creates the right node instead of the left node.
Similarly, when two nodes are joined, the builtin editor deletes the latter node and moves its children to the end of the preceding node instead of deleting the former node and moving its child to the start of the following node.
WebRTC application developers can now specify a target in milliseconds of media for the jitter buffer to hold. Altering the target value allows applications to control the tradeoff between playout delay and the risk of running out of audio or video frames due to network jitter.
Change array by copy provides additional methods on Array.prototype and TypedArray.prototype to enable changes on the array by returning a new copy of it with the change.
The animation-composition property is now supported, allowing a declarative way to define the composite operation used when multiple animations affect the same property simultaneously.
Added the URL.canParse() function to allow easy and fast checking if URLs are valid and parseable.
IndexedDB is now also supported in private browsing without memory limits thanks to encrypted storage on disk. The temporary keys to decrypt the information are hold in RAM only and all stored information is purged at the normal end of a private browsing session from disk.
Supports conditions are now supported in CSS import rules @import supports(...)
Community Contributions:
With the release of Firefox 115, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 8 of whom were brand new volunteers!

New in Firefox 114.0.2 (Jun 20, 2023)

New in Firefox 115.0 Beta 7 (Jun 19, 2023)

New:
Hardware video decoding enabled for Intel GPUs on Linux.
Migrating from another browser? Now you can bring over payment methods you've saved in Chrome-based browsers to Firefox.
The Tab Manager dropdown now features close buttons, so you can close tabs more quickly.
The Firefox for Android address bar's new search button allows you to easily switch between search engines and search your bookmarks and browsing history.
Fixed:
Windows Magnifier now follows the text cursor correctly when the Firefox title bar is visible.
Changed:
On Linux, middle clicks on the new tab button will now open the xclipboard contents in the new tab. If the xclipboard content is a URL then that URL is opened, any other text is opened with your default search provider. This feature can be turned off using browser.tabs.searchclipboardfor.middleclick in about:config.
For users with a Firefox Colorways built-in theme, the theme will be automatically migrated to the same theme hosted on addons.mozilla.org for Firefox profiles that have disabled add-ons auto-updates. This will allow users to keep their Colorways theme when they are later removed from Firefox installer files.
Undo and redo are now available in Password fields.
Developer:
Developer Information:
In web development, we rely on third-party libraries which you may not be interested in while debugging. These can be ignored. Ignoring them means that breakpoints will not get hit and they are skipped during stepping.
You can now choose to Hide ignore-listed sources in the Developer Tools source tree.
Web Platform:
WebRTC application developers can now specify a target in milliseconds of media for the jitter buffer to hold. Altering the target value allows applications to control the tradeoff between playout delay and the risk of running out of audio or video frames due to network jitter.
Change array by copy provides additional methods on Array.prototype and TypedArray.prototype to enable changes on the array by returning a new copy of it with the change.
The animation-composition property is now supported, allowing a declarative way to define the composite operation used when multiple animations affect the same property simultaneously.
The builtin editor now behaves similarly to other browsers with contenteditable and designMode when splitting a node, e.g. typing Enter to split a paragraph, and also when joining two nodes, e.g. typing Backspace at start of a paragraph to join the paragraph and previous one.
When a node is split, the builtin editor creates a new node after the original one instead of before, i.e. creates the right node instead of the left node.
Similarly, when two nodes are joined, the builtin editor deletes the latter node and moves its children to the end of the preceding node instead of deleting the former node and moving its child to start of the following node.
Added the URL.canParse() function to allow easy and fast checking if URLs are valid and parseable.

New in Firefox 114.0.1 (Jun 9, 2023)

New in Firefox 113.0.2 (May 23, 2023)

New in Firefox 113.0.1 (May 15, 2023)

New in Firefox 113.0 (May 10, 2023)

New
Say hello to enhanced Picture-in-Picture! Rewind, check video duration, and effortlessly switch to full-screen mode on the web's most popular video websites.
Firefox's address bar is already a great place to search for what you're looking for. Now you'll always be able to see your web search terms and refine them while viewing your search's results - no additional scrolling needed! Also, a new result menu has been added making it easier to remove history results and dismiss sponsored Firefox Suggest entries.
Private windows now protect users even better by blocking third-party cookies and storage of content trackers.
Passwords automatically generated by Firefox now include special characters, giving users more secure passwords by default.
Firefox 113 introduces a redesigned accessibility engine which significantly improves the speed, responsiveness, and stability of Firefox when used with:
Screen readers, as well as certain other accessibility software;
East Asian input methods;
Enterprise single sign-on software; and
Other applications which use accessibility frameworks to access information.
Importing bookmarks from Safari or a Chrome-based browser? The favicons for those bookmarks will now also be imported by default to make them easier to identify.
Firefox 113 now supports AV1 Image Format files containing animations (AVIS), improving support for AVIF images across the web.
The Windows GPU sandbox first shipped in the Firefox 110 release has been tightened to enhance the security benefits it provides.
A 13-year-old feature request was fulfilled and Firefox now supports files being drag-and-dropped directly from Microsoft Outlook. A special thanks to volunteer contributor Marco Spiess for helping to get this across the finish line!
Users on macOS can now access the Services sub-menu directly from Firefox context menus.
On Windows, the elastic overscroll effect has been enabled by default. When two-finger scrolling on the touchpad or scrolling on the touchscreen, you will now see a bouncing animation when scrolling past the edge of a scroll container.
Firefox is now available in the Tajik (tg) language.
Fixed:
Various security fixes:
CVE-2023-32205: Browser prompts could have been obscured by popups
CVE-2023-32206: Crash in RLBox Expat driver
CVE-2023-32207: Potential permissions request bypass via clickjacking
CVE-2023-32208: Leak of script base URL in service workers via import()
CVE-2023-32209: Persistent DoS via favicon image
CVE-2023-32210: Incorrect principal object ordering
CVE-2023-32211: Content process crash due to invalid wasm code
CVE-2023-32212: Potential spoof due to obscured address bar
CVE-2023-32213: Potential memory corruption in FileReader::DoReadData()
MFSA-TMP-2023-0002: Race condition in dav1d decoding
CVE-2023-32214: Potential DoS via exposed protocol handlers
CVE-2023-32215: Memory safety bugs fixed in Firefox 113 and Firefox ESR 102.11
CVE-2023-32216: Memory safety bugs fixed in Firefox 113
Changed:
The long-deprecated mozRTCPeerConnection, mozRTCIceCandidate, and mozRTCSessionDescription WebRTC interfaces have been removed. Sites should utilize the non-prefixed versions instead.
Enterprise:
Policies:
The Containers policy has been added to allow setting the initital list of containers. This does not apply to the ESR.
The Preferences policy has been updated to allow setting OCSP preferences. These preferences are security.OCSP.enabled, xpinstall.signatures.required, and security.ssl.enable_ocsp_stapling.
Developer:
There have been numerous improvements to the Debugger's "Search in files" feature (also known as "Project search"):
The panel has been moved to a regular side panel, which allows you to keep the results list visible while opening scripts in the editor;
Results from minified and pretty-printed tabs, as well as matches from the node_modules folder, are displayed;
Results from ignored files are hidden; and
Glob patterns and search modifiers are also supported, making it possible to execute case-sensitive or regex searches on specific parts of your project.
Additional features include support for pretty printing inline scripts in HTML files and column breakpoints in pretty printed sources.
It is now possible to override a JavaScript file in the debugger. In the Debugger, under the Sources tree, you can use the "Add script override" context menu entry. This action will download the file onto your machine, allowing you to edit it. After reloading the page, the local file will be loaded instead of the original script (indicated by a purple icon when a file is overridden).
Web Platform:
Module scripts can now import other ES module scripts on worklets.
Firefox 113 includes new CSS functionality, including improved support for the color (level 4) specification (such as the lab(), lch(), oklab(), oklch(), and color() functions) and the scripting media query.
Firefox 113 adds support for a number of WebRTC features for improved interoperability: RTCMediaSourceStats, RTCPeerConnectionState, RTCPeerConnectionStats ("peer-connection" RTCStatsType), RTCRtpSender.setStreams(), and RTCSctpTransport.
The forced-color-adjust property is now supported, allowing authors to opt an element out of color changes in Forced Color Mode for improved readability where the automatically-picked contrasting colors are not ideal.

New in Firefox 113.0b Beta (Apr 28, 2023)

Say hello to enhanced Picture-in-Picture! Rewind, check video duration, and effortlessly switch to full-screen mode on the web's most popular video websites.
Passwords generated in Firefox now include special characters, making them more secure.
Importing bookmarks from Safari or a Chrome-based browser? The favicons for those bookmarks will now also be imported by default to make them easier to identify.
The Windows GPU sandbox first shipped in the Firefox 110 release has been tightened to enhance the security benefits it provides.
A 13-year-old feature request was fulfilled, and Firefox now supports files being drag-and-dropped directly from Microsoft Outlook. A special thanks to volunteer contributor Marco Spiess for helping to get this across the finish line!
Mac users can now access macOS Services directly from the context menu.
On Windows, the elastic overscroll effect is now enabled by default, with two fingers scrolling on touchpad or scrolling on touchscreen, you will see a bouncing animation when scrolling past the edge of a scroll container.
AV1 Image Format files containing animations (AVIS) are now supported, improving Firefox' support for AVIF images across the web.
Websites that use window.print() can now be printed in Firefox for Android.
Firefox for Android now supports hardware accelerated AV1 video decoding by default with supported hardware or via fallback to software decoding.
Following up on the work already shipped on macOS and Linux in Firefox 110, GPU-accelerated Canvas2D is now enabled by default for Firefox for Android also.
Locale added: Tajik (tg)
Firefox 113 introduces a redesigned accessibility engine which significantly improves the speed, responsiveness and stability of Firefox for users of screen readers, as well as certain other accessibility software, east Asian input methods, enterprise single sign-on software and other applications which use accessibility frameworks to access information.
The Awesomebar result menu is now enabled for all users, allowing you to remove history results and dismiss sponsored Firefox Suggest results.

New in Firefox 112.0.2 (Apr 26, 2023)

New in Firefox 112.0.1 (Apr 25, 2023)

New in Firefox 112.0 (Apr 12, 2023)

New:
Right-clicking on password fields now shows an option to reveal the password.
Ubuntu Linux users can now import their browser data from the Chromium Snap package. Currently, this will only work if Firefox is not also installed as a Snap package, but work is underway to address this!
Do you use the tab list panel in the tab bar? If so, you can now close tabs by middle-clicking items in that list.
You've always been able to un-close a tab by using (Cmd/Ctrl)-Shift-T. Now, that same shortcut will restore the previous session if there are no more closed tabs from the same session to re-open.
For all ETP Strict users, we extended the list of known tracking parameters that are removed from URLs to further protect our users from cross-site tracking.
Enables overlay of software-decoded video on Intel GPUs in Windows. Improves video down scaling quality and reduces GPU usage.
Fixed:
Various security fixes.
Changed:
The deprecated U2F Javascript API is now disabled by default. The U2F protocol remains usable through the WebAuthn API. The U2F API can be re-enabled using the security.webauth.u2f preference.
Enterprise:
Bug Fixes:
Some integer preferences were being improperly set as booleans, particularly pdfjs. preferences. This was fixed in bug 1820195.
Policies:
The EnableTrackingProtection policy has been updated to support the new EmailTracking option. This does not apply to the ESR.
The xpinstall.signatures.required preference can now be set via the Preferences policy on the ESR only.
Developer:
Developer Tools:
HTML:
The HTMLElement property inert is now fully enabled. It allows the browser to ignore content or interactive elements that are within an HTMLElement with the inert attribute. See Firefox bug 1764263 for more details.
Removals:
CSS:
The overlay keyword value for the overflow property is now supported as a legacy alias of the keyword value auto (Firefox bug 1817189).
APIs:
Removes support for IDBMutableFile, IDBFileRequest, IDBFileHandle, and IDBDatabase.createMutableFile(). These interfaces are not present in any specification, have been behind a preference since version 102, and have been removed from the other main browser engines for some years. (Firefox bug 1500343.)
navigator.getAutoplayPolicy() is now supported, allowing developers to configure autoplay of media elements and audio contexts based on whether autoplay is allowed, disallowed, or only allowed if the audio is muted. See Firefox bug 1773551 for more details.
Rounded rectangles can now be drawn in 2D canvases using CanvasRenderingContext2D.roundRect(), Path2D.roundRect() and OffscreenCanvasRenderingContext2D.roundRect(). See Firefox bug 1756175 for more details.
WebDriver BiDi:
Implemented the browsingContext.print command, which allows clients to request a rendered PDF document of the browsing context, represented as a Base64-encoded string. See Firefox bug 1806810 for more details.
Implemented script.addPreloadScript and script.removePreloadScript commands, which let test clients inject a functionality that's guaranteed to be available for any content scripts that are subsequently loaded, and before any later scripts that WebDriver injects into the context. See Firefox bug 1806420 and Firefox bug 1806465 for more details.
Element and ShadowRoot references as stored in the node cache can now be used in both Marionette and WebDriver BiDi by their exact same unique reference. See Firefox bug 1770733 for more details.
Removed isRedirect from the network events base parameters (Firefox bug 1819875).
Marionette:
Fixed an issue where the payload of a response was not wrapped within a value field based on certain data type. (Firefox bug 1819029).
Fixed an issue where WebDriver:ElementClear was emitting an extra change event for content editable elements (Firefox bug 1744925).
Changes for add-on developers:
The properties usedDelegatedCredentials, usedEch, usedOcsp, and usedPrivateDns have been added to webRequest.SecurityInfo. These properties provide information about the security of the connection used for a web request (Firefox bug 1804460).
The property "type" is supported in the "background" manifest key. Setting this key to "module" loads background scripts specified with "scripts" as ES modules, avoiding the need to switch to background pages to use ES modules (Firefox bug 1811443).

New in Firefox 112.0b7 Beta (Mar 27, 2023)

New in Firefox 111.0.1 (Mar 21, 2023)

New in Firefox 110.0.1 (Feb 28, 2023)

New in Firefox 110.0 (Feb 15, 2023)

New:
It's now possible to import bookmarks, history and passwords not only from Edge, Chrome or Safari but also from Opera, Opera GX, and Vivaldi for all the folks who want to move over to Firefox instead!
GPU sandboxing has been enabled on Windows.
Note: A bug in the popular X-Mouse Button Control (XMBC) tool may cause mouse wheel scrolling to stop working. The author(s) are working on an update. Meanwhile, scrolling can be restored by reconfiguring XMBC: either disable the Make scroll wheel scroll window under cursor option in the global settings, or enable the Disable scroll window under cursor option if using a custom profile for Firefox.
On Windows, third-party modules can now be blocked from injecting themselves into Firefox, which can be helpful if they are causing crashes or other undesirable behavior.
Date, time, and datetime-local input fields can now be cleared with Cmd+Backspace and Cmd+Delete shortcut on macOS and Ctrl+Backspace and Ctrl+Delete on Windows and Linux.
GPU-accelerated Canvas2D is enabled by default on macOS and Linux.
WebGL performance improvement on Windows, MacOS and Linux.
Enables overlay of hardware-decoded video with non-Intel GPUs on Windows 10/11, improving video playback performance and video scaling quality.
Fixed:
Various security fixes.
Changed:
Colorways are no longer available in Firefox, at least not in the same way. You can still access your saved and active Colorways by selecting Add-ons and themes from the Firefox menu. Additionally, you can now install Colorways from all of the previous collections by visiting Colorways by Firefox on the Mozilla Add-ons website.
Developer:
CSS:
Container queries and container query length units are now supported by default. For more information on these queries and the related units of length, see the CSS Container Queries documentation (bug 1809720).
The color-gamut media query is now supported (bug 1422237).
The list attribute is supported in <input> elements with type="color" on Windows and Linux (bug 960984).
JavaScript:
Serialization of native Error types now includes the stack property in workers when using Worker.postMessage() and structuredClone(). With this addition, cloning native error stacks now works for all methods that use the structured clone algorithm, in both the main thread and workers. (See bug 1774866 for more details.)
APIs:
The midi permission of the Permission API is now supported. This allows the permission status for using the Web MIDI API to be queried using navigator.permissions.query() (bug 1772166).
ReadableStream now supports asynchronous iteration over the chunks in a stream using the for await...of syntax (bug 1734244).
WebRTC now supports sending the set of available encodings when adding a tranceiver to a peer connection, and also getting the active encoding associated with a sender. Specifically, RTCPeerConnection.addTransceiver() now supports using the sendEncodings option in the init parameter object, and RTCRtpEncodingParameters.active can be used to determine whether or not the encoding is being used to send data. (See bug 1676855 for more details.)
WebRTC methods RTCRtpSender.getParameters(), RTCRtpSender.setParameters(), and RTCRtpReceiver.getParameters() are now compliant with the specification (bug 1401592).
WebDriver conformance (WebDriver BiDi, Marionette):
WebDriver BiDi:
Added support for the network.beforeRequestSent (bug 1790368), the network.responseStarted (bug 1790370), and the network.responseCompleted (bug 1790372) events.
Added support for the browsingContext.captureScreenshot command to capture full page screenshots (bug 1800086).
Added support for serialization and deserialization of generic platform objects (bug 1792524), and for NodeList and HTMLCollection platform objects (bug 1802284).
Added a timestamp field to the browsingContext.domContentLoaded and browsingContext.load events (bug 1790378).
Added a type field to the response for script.evaluate and script.callFunction to indicate either success or exception results (bug 1803599).
Marionette:
The cache for known nodes (element and shadow root references) has been moved from the parent to the web content process following recent WebDriver classic changes (bug 1692468).
Improved the JSON serialization and deserialization algorithms to be compliant with the WebDriver classic specification (bug 1794078).
Changes for add-on developers:
The defaultZoomFactor property of tabs.ZoomSettings now returns the value of the default zoom factor setting (bug 1772166)
Enterprise:
Various bug fixes and new policies have been implemented in the latest version of Firefox.
Web Platform:
Firefox now supports CSS named pages, allowing web pages to perform per-page layout and add page-breaks in a declarative manner when printing.
Firefox now supports CSS size container queries, see the MDN page for documentation on this feature.

New in Firefox 108.0.2 (Jan 6, 2023)

New in Firefox 109.0b5 Beta (Dec 21, 2022)

New in Firefox 108.0.1 (Dec 18, 2022)

New in Firefox 108.0 (Dec 13, 2022)

New in Firefox 108.0b8 Beta (Nov 30, 2022)

New in Firefox 107.0.1 (Nov 29, 2022)

New in Firefox 107.0 (Nov 15, 2022)

New in Firefox 160.0.5 (Nov 5, 2022)

New in Firefox 160.0.4 (Nov 3, 2022)

New in Firefox 106.0.2 (Oct 26, 2022)

New in Firefox 106.0.1 (Oct 21, 2022)

New in Firefox 107.0b1 Beta (Oct 19, 2022)

New in Firefox 106.0 (Oct 19, 2022)

New
It is now possible to edit PDFs: including writing text, drawing, and adding signatures.
Setting Firefox as your default browser now also makes it the default PDF application on Windows systems.
You can now pin private windows to your Windows taskbar on Window 10 and Windows 11 for simpler access. Also, private windows have been redesigned to increase the feeling of privacy.
Swipe-to-navigate (two fingers on a touchpad swiped left or right to perform history back or forward) now works for Linux users on Wayland.
Text Recognition in images allows users on macOS 10.15 and higher to extract text from the selected image (such as a meme or screenshot).
Extracted text is copied to the clipboard in order to share, store, or search—without needing to manually retype everything.
“Firefox View” helps you get back to content you previously discovered. A pinned tab allows you to find and open recently closed tabs on your current device, access tabs from other devices (via our “Tab Pickup” feature), and change the look of the browser (with Colorways).
With the launch of the “Independent Voices” collection, Firefox is introducing 18 new “Colorways.” You can now access a “Colorways” modal experience via “Firefox View”; each new color is accompanied with a bespoke graphic and a text description that speaks to its deeper meaning. The collection will be available through Jan 16.
Various security fixes:
CVE-2022-42927: Same-origin policy violation could have leaked cross-origin URLs
CVE-2022-42928: Memory Corruption in JS Engine
CVE-2022-42929: Denial of Service via window.print
CVE-2022-42930: Race condition in DOM Workers
CVE-2022-42931: Username saved to a plaintext file on disk
CVE-2022-42932: Memory safety bugs fixed in Firefox 106 and Firefox ESR 102.4
Web Platform:
A major upgrade to our WebRTC capabilities (libwebrtc library upgraded from version 86 to 103) brings multiple improvements:
Better screen sharing for Windows and Linux Wayland users.
Lower CPU usage and increased frame rates during WebRTC screen capture on macOS.
RTP performance and reliability improvements.
Richer statistics.
Cross-browser and service compatibility improvements.

New in Firefox 105.0.3 (Oct 8, 2022)

New in Firefox 106.0b1 Beta (Oct 5, 2022)

New in Firefox 105.0.2 (Oct 5, 2022)

New in Firefox 105.0.1 (Oct 4, 2022)

New in Firefox 105.0 (Sep 20, 2022)

New in Firefox 104.0.2 (Sep 6, 2022)

New in Firefox 104.0.1 (Aug 30, 2022)

New in Firefox 104.0 (Aug 23, 2022)

New in Firefox 103.0.2 (Aug 9, 2022)

New in Firefox 103.0.1 (Aug 8, 2022)

New in Firefox 103.0 (Jul 26, 2022)

New in Firefox 102.0.1 (Jul 11, 2022)

New in Firefox 103.0b5 Beta (Jul 6, 2022)

New in Firefox 102.0 (Jun 28, 2022)

New in Firefox 101.0.1 (Jun 20, 2022)

New in Firefox 102.0b2 Beta (Jun 1, 2022)

New in Firefox 101.0 (May 31, 2022)

New:
Reading is now easier with the prefers-contrast media query, which allows sites to detect if the user has requested that web content is presented with a higher (or lower) contrast.
It’s your choice! All non-configured MIME types can now be assigned a custom action upon download completion.
Firefox now allows users to use as many microphones as you want, at the same time, during video conferencing. The most exciting benefit is that you can easily switch your microphones at any time (if your conferencing service provider enables this flexibility).
Fixed:
Various security fixes.
Enterprise:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can find more information in the Firefox for Enterprise 101 Release Notes.
Developer:
Inspector panel: When adding/removing a class name to/from an existing HTML element (using .cls button in Rules View), an autocomplete drop down automatically offers all existing class names on the page. In Firefox 101 the selected class name in the autocomplete drop-down list is auto-applied immediately as the user changes the selection of the autocomplete list (using up/down arrow keys). This is especially useful for quick testing of various styles.
Inspector panel: This new option can be used to disable “drag to update” features in the Rule View (values of some CSS properties e.g., sizes can be modified by dragging the mouse horizontally).
Screenshot showing Inspector Panel drag to update option checkbox
WebDriver BiDi: This protocol is enabled on the release channel to support external tools such as Selenium, which plan to start using WebDriver BiDi for Firefox. WebDriver-BiDi aims to provide a cross-browser protocol for browser automation that meets the requirements of modern web application testing tools. This allows both the client and the server to send & receive requests and responses.
Web Platform:
Firefox new has added support for large, small, dynamic viewport units and logical ones (*vi and *vb). This gives users the flexibility to choose whether page elements are sized to the “smallest” viewport size (dynamic toolbar visible), “largest” viewport size (dynamic toolbar hidden), or “dynamic” viewport size (based on current status of dynamic toolbar).
Firefox 101 features added web conferencing support for enumerating (reducing errors caused by transposing or mistyping numbers) and selecting multiple audio input devices (giving you the ability to record or process multiple separate audio sources together, synchronously, at once) through navigator.mediaDevices.enumerateDevices().

New in Firefox 100.0.2 (May 21, 2022)

New in Firefox 100.0.1 (May 17, 2022)

New in Firefox 100.0 (May 4, 2022)

New:
We now support captions/subtitles display on YouTube, Prime Video, and Netflix videos you watch in Picture-in-Picture. Just turn on the subtitles on the in-page video player, and they will appear in PiP.
Picture-in-Picture now also supports video captions on websites that use WebVTT (Web Video Text Track) format, like Coursera.org, Canadian broadcasting Corporation, and many more.
On the first run after install, Firefox detects when its language does not match the operating system language and offers the user a choice between the two languages.
Firefox spell checking now checks spelling in multiple languages. To enable additional languages, select them in the text field’s context menu.
HDR video is now supported in Firefox on Mac—starting with YouTube! Firefox users on macOS 11+ (with HDR-compatible screens) can enjoy higher-fidelity video content. No need to manually flip any preferences to turn HDR video support on—just make sure battery preferences are NOT set to “optimize video streaming while on battery”.
Hardware accelerated AV1 video decoding is enabled on Windows with supported GPUs (Intel Gen 11+, AMD RDNA 2 Excluding Navi 24, GeForce 30). Installing the AV1 Video Extension from the Microsoft Store may also be required.
Video overlay is enabled on Windows for Intel GPUs, reducing power usage during video playback.
Improved fairness between painting and handling other events. This noticeably improves the performance of the volume slider on Twitch.
Scrollbars on Linux and Windows 11 won't take space by default. On Linux, users can change this in Settings. On Windows, Firefox follows the system setting (System Settings > Accessibility > Visual Effects > Always show scrollbars).
Firefox now supports credit card autofill and capture in the United Kingdom.
Firefox now ignores less restricted referrer policies—including unsafe-url, no-referrer-when-downgrade, and origin-when-cross-origin—for cross-site subresource/iframe requests to prevent privacy leaks from the referrer.
Fixed:
Users can now choose preferred color schemes for websites. Theme authors can now make better decisions about which color scheme Firefox uses for menus. Web content appearance can now be changed in Settings.
Beginning in this release, the Firefox installer for Windows is signed with a SHA-256 digest, rather than SHA-1. Update KB4474419 is required for successful installation on a computer running Microsoft Windows 7. For more details about this update, visit the Microsoft Technical Support website.
The performance of deeply-nested display: grid elements is greatly improved.
Support for profiling multiple java threads has been added.
Soft-reloading a web page will no longer cause revalidation for all resources.
Non-vsync tasks are given more time to run, which improves behavior on Google docs and Twitch.
Geckoview APIs have been added to control the start/stop time of capturing a profile.
Various security fixes.
Changed:
Firefox has a new focus indicator for links which replaces the old dotted outline with a solid blue outline. This change unifies the focus indicators across form fields and links, which makes it easier to identify the focused link, especially for users with low vision.
New users can now set Firefox as the default PDF handler when setting Firefox as their default browser.
Some websites might not work correctly in Firefox version 100 due to Firefox's new three-digit number.

New in Firefox 99.0.1 (Apr 12, 2022)

New in Firefox 99.0 (Apr 6, 2022)

New in Firefox 98.0.2 (Mar 23, 2022)

New in Firefox 98.0 (Mar 9, 2022)

New:
Firefox has a new optimized download flow. Instead of prompting every time, files will download automatically. However, they can still be opened from the downloads panel with just one click. Easy!
You’ll find you have a number of options, including:
Always Open Similar Files: Make Firefox automatically open downloaded files of the same type with the system default application.
Show In Folder: Open the folder that contains your downloaded files.
Go To Download Page: Surfaces the download reference page even after leaving the site or closing the tab.
Copy Download Link: Copy the download link to share it, save it, or for any applicable use.
Delete: You can now delete downloaded files directly from the download panel and other download views using the context menu.
Remove From History: Remove a file from your list of downloaded files.
Clear Preview Panel: Clear the list of downloaded items in the preview panel that opens when you start a download.
In this release, you’ll also see that Firefox no longer asks what to do for each file by default. You won’t be prompted to choose a helper application or save to disk before downloading a file unless you have changed your download action setting for that type of file.
And now, every time you start a download, Firefox will automatically bring up the Downloads panel by default. This means you’ll experience minimal interruptions and easily find your downloaded files. Plus, to avoid having to close it several times, the panel won't show if there are multiple downloads in progress.
You can now click on a file in the Downloads panel to open it even before it has finished downloading. Firefox will open the file as soon as it is available. Firefox: saving you time and helping you get back to what you care about!
Any files you download will be immediately saved on your disk. Depending on the current configuration, they’ll be saved in your preferred download folder, or you’ll be asked to select a location for each download. Windows and Linux users will find their downloaded files in the destination folder. They’ll no longer be put in the Temp folder.
Firefox allows users to choose from a number of built-in search engines to set as their default. In this release, some users who had previously configured a default engine might notice their default search engine has changed since Mozilla was unable to secure formal permission to continue including certain search engines in Firefox.
Fixed:
Now, you can set a default app to open a file type. Choose the application you want to use to open files of a specific type in your Firefox settings.
After updating to Firefox version 98, "Always ask" download actions will now be reset.
Various security fixes.
Enterprise:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can find more information in the Firefox for Enterprise 98 Release Notes.
Developer:
The Compatibility sidebar panel in the DevTools Inspector already available on pre-release channels will become available on the release channel in version 98 . It provides compatibility warnings for the CSS properties used on the selected element, as well as for the overall page.
Developers may use it to detect web-compatibility issues early, without having to test in each browser. All compatibility data are pulled from MDN.
Event listeners for a given node can now be disabled from the Inspector Event Tooltip, in the markup view. Also, The "event" badge style is updated when at least one event is disabled to remind the user that something was changed.
New UI in the Browser Toolbox to toggle Fluent pseudolocalization bidi / accented
“Ignore line” context menu entry added in the debugger editor gutter when devtools.debugger.features.blackbox-lines is true. Also, there is a better “Ignore source” icon and editor background colors for ignored lines.
Auto-open devtools for tabs opened via window.open (behind devtools.popups.debug). On a page where you already have DevTools opened, if a new tab is created via window.open, the toolbox will automatically move to the new tab, with the new document selected in both the iframe picker and the context selector
Web Platform:
The <dialog> HTML element already available on pre-release channels will become available on the release channel in version 98.
Form associated custom elements will become available on the release channel in version 98. This allows web authors to define and create custom elements that can be participated in form submission.
The hyphenate-character CSS property can be used to set a string that is used instead of a hyphen character (-) at the end of a hyphenation line break.
Community Contributions:
With the release of Firefox 98, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 5 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Abhishek: Bug 1746631
Anastasios Bitha: Bug 1650197 and Bug 1751923
Hikota Nakatani: Bug 1751626
Kash: Bug 1752050 and Bug 1752567 and Bug 1753284
Lyubomir: Bug 1731050
Meg Viar: Bug 1751057
Rolf Martin Glomsrud: Bug 1739648
Shane Hughes: Bug 1718117 and Bug 1744366 and Bug 1747250

New in Firefox 97.0.2 (Mar 8, 2022)

New in Firefox 97.0.1 (Feb 17, 2022)

New in Firefox 97.0 (Feb 17, 2022)

New:
On February 8, we expired the 18 colorway themes that shipped along with Firefox 94. This signals the end of a special, limited-time feature set. However, you can hold onto your favorite colorway, as long as you’re using it on the expiration date. In other words, if a colorway is “enabled” in the add-ons manager, that colorway is yours forever.
Beginning February 15, we are releasing 6 brand-new colorways in a special partner collaboration. U.S.-based fans of the film can visit truecolors.firefox.com to activate official Turning Red-inspired Colorways, available exclusively in Firefox for desktop through April 30, 2022. Firefox users who visit the “True Colors” campaign landing page will be able to modify how their web browser looks, with colors and moods inspired by some of the main characters in the film. To enjoy the new Colorways, you’ll need to make sure you upgrade to the latest Firefox 97 version. This collection will be available in the add-ons manager, within the Colorways section. Read more about colorway updates here.
Firefox now supports and displays the new style of scrollbars on Windows 11.
Fixed:
Various security fixes:
CVE-2022-22753: Privilege Escalation to SYSTEM on Windows via Maintenance Service
CVE-2022-22754: Extensions could have bypassed permission confirmation during update
CVE-2022-22755: XSL could have allowed JavaScript execution after a tab was closed
CVE-2022-22756: Drag and dropping an image could have resulted in the dropped object being an executable
CVE-2022-22757: Remote Agent did not prevent local websites from connecting
CVE-2022-22759: Sandboxed iframes could have executed script if the parent appended elements
CVE-2022-22760: Cross-Origin responses could be distinguished between script and non-script content-types
CVE-2022-22761: frame-ancestors Content Security Policy directive was not enforced for framed extension pages
CVE-2022-22764: Memory safety bugs fixed in Firefox 97 and Firefox ESR 91.6
CVE-2022-0511: Memory safety bugs fixed in Firefox 97
Changed:
Support for directly generating PostScript for printing on Linux has been removed. Printing to PostScript printers still remains a supported option, however.
Enterprise:
Bug Fixes:
The version of PDFjs used in the Firefox ESR has been updated to the latest version. This fixed a number of issues related to selection and clipboard actions.
When an update to the Firefox ESR fails, the door hanger now properly links to the Firefox ESR download. This was fixed in bug 1592731.
When presented with multiple authentication headers, Firefox now properly prioritizes them from most secure to least secure. This was fixed in bug 650091. Unfortunately, the fix was too involved to backport to the current Firefox ESR.
About pages that were blocked via policy could be accessed by changing the URL of the page to mixed case. This was fixed in bug 1750221.
In Firefox 96, a fix caused a regression where JSON policies could not be of the REG_SZ type in the Windows registry. This was fixed in bug 1750233.
The TLS override UI has been removed from the certificate error page. The preferences are still there but will be removed soon. This was done in bug 1745678.
Policies:
The DisabledCiphers policy has been updated with additional ciphers. This was done in bug 1745065.
unresolved:
Users running WebRoot SecureAnywhere Antivirus may experience impaired functionality when upgrading to Firefox 97. Closing WebRoot will allow Firefox to resume normal operation.
Community Contributions:
With the release of Firefox 97, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 7 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
bnhunsaker: Bug 1707379 - Firefox raises window when it gains focus when using yabai with focus_follows_mouse with autofocus, but not autoraise
Dennis Jackson: Bug 1742617 - Crash in [@ nsDocShell::MaybeFixBadCertDomainErrorURI]
Jin Chun: Bug 1704133 - Removing stale probe sw.synthesized_res_count
Kevin Daudt: Bug 1745560 - Firefox 91.4 fails to build against wayland 1.20
Meg Viar: Bug 1744466 - Make "More from Mozilla" strings localizable
Neia Finch:
Bug 1613634 - CoalesceMutationEvents causes excessive page render times
Bug 1747922 - Replace MathML font variant constants with enum class
Nick Rishel:
Bug 1592731 - Firefox ESR's update failure doorhanger should direct user to the ESR download page
Bug 1730110 - Update manual update URL
Bug 1746517 - Add query parameter to manual update URL
Patrick:
Bug 1742312 - Remove NPAPI related flags
Bug 1743102 - Add color-scheme meta tag to remaining compatible about: pages
Pier Angelo Vendrame: Bug 1745715 - Bundled fonts should have Base visibility even when they are also system-wide installed
Rashelle:
Bug 1739515 - Clean up preference for supporting multiple PiP windows
Bug 1742585 - PIP button z-index not respected with semi-transparent div
Bug 1744633 - Remove unnecessary browser_closePipAfterCloseBrowser.js test for Picture-in-Picture

New in Firefox 96.0.3 (Jan 27, 2022)

New in Firefox 96.0.2 (Jan 20, 2022)

New in Firefox 96.0.1 (Jan 20, 2022)

New in Firefox 96.0 (Jan 11, 2022)

New in Firefox 95.0.2 (Dec 19, 2021)

New in Firefox 95.0 (Dec 7, 2021)

New in Firefox 94.0.2 (Nov 23, 2021)

New in Firefox 94.0 (Nov 2, 2021)

New:
With 94, you’ll find a selection of six fun seasonal Colorways (available for a limited time only). Now you can find a color to suit (or lift) your every mood.
Fun fact: Did you know we have more daily users with color themes than dark or Alpenglow on Beta? With Firefox 89, 32% of users clicked through to customize their color theme. And that was just on the first day! We decided to introduce these new Colorways to give our users more to love.
Firefox macOS now uses Apple's low power mode for fullscreen video on YouTube and Twitch. This meaningfully extends battery life in long viewing sessions. Now your kids can find out what the fox says on a loop without you ever missing a beat…
With this release, power users can use about:unloads to release system resources by manually unloading tabs without closing them.
On Windows, there will now be fewer interruptions because Firefox won’t prompt you for updates. Instead, a background agent will download and install updates even if Firefox is closed.
To better protect all Firefox users against side-channel attacks such as Spectre, we’ve introduced Site Isolation. We’ve got your back...errr...side!
We’re rolling out the Firefox Multi-Account Containers extension with Mozilla VPN integration. This lets you use a different server location for each container.
Firefox no longer warns you by default when you exit the browser or close a window using a menu, button, or three-key command. This should cut back on unwelcome notifications which is always nice--however, if you prefer a bit of notice, you’ll still have full control over the quit/close modal behavior. All warnings can be managed within Firefox Settings. No worries! (More details)
And now, Firefox supports the new Snap Layouts menus when running on Windows 11.
Fixed:
We’ve reduced the overhead of using performance.mark() and performance.measure() APIs with a large set of performance entries.
Plus, we’ve modified paint suppression during load to greatly improve warmload performance in Site Isolation mode.
You’ll also notice a small reduction in Javascript memory usage.
With this release, you’ll notice faster Javascript property enumeration as well.
We’ve also implemented better scheduling of garbage collection which has improved some pageload benchmarks.
This release also sees reduced CPU usage during socket polling for HTTPS connections.
Additionally, you’ll notice faster storage initialization.
We’ve also improved cold startup by reducing main thread I/O.
Plus, closing devtools now reclaims more memory than ever before.
And we’ve improved pageload (especially with Site Isolation mode) by setting a higher priority for loading and displaying images.
Various security fixes
Enterprise:
Enterprise users now have more control over Firefox deployments with the availability of our MSIX package on Windows platforms.
You’ll also notice various bug fixes and new policies have been implemented in this latest version of Firefox.

New in Firefox 93.0 (Oct 5, 2021)

New in Firefox 92.0.1 (Sep 24, 2021)

New in Firefox 92.0 (Sep 7, 2021)

New in Firefox 91.0.2 (Aug 24, 2021)

New in Firefox 91.0 (Aug 10, 2021)

New in Firefox 90.0.1 (Jul 20, 2021)

New in Firefox 91.0 Beta 2 (Jul 14, 2021)

New in Firefox 90.0 (Jul 13, 2021)

New in Firefox 89.0.2 (Jun 23, 2021)

New in Firefox 89.0.1 (Jun 17, 2021)

New in Firefox 89.0 (Jun 1, 2021)

New:
Say hello to a fresh new Firefox, designed to get you where you want to go even faster. We’ve redesigned and modernized the core experience to be cleaner, more inviting, and easier to use.
Beginning in 89, you’ll notice a number of changes, including:
Simplified browser chrome and toolbar: Less frequently used items removed to focus on the most important navigation items.
Clear, streamlined menus: Re-organized and prioritized menu content according to usage. Updated labels and removed iconography.
Updated prompts: Infobars, panels, and modals have a cleaner design and clearer language.
Inspired tab design: Floating tabs neatly contain information and surface cues when you need them, like visual indicators for audio controls. The rounded design of the active tab supports focus and signals the ability to easily move the tab as needed.
Fewer interruptions: Reduced number of alerts and messages, so you can browse with fewer distractions.
Cohesive, calmer visuals: Lighter iconography, a refined color palette, and more consistent styling throughout.
This release also includes enhancements to our privacy offerings:
We’ve enhanced the privacy of the Firefox Browser’s Private Browsing mode with Total Cookie Protection, which confines cookies to the site where they were created, preventing companies from using cookies to track your browsing across sites. This feature was originally launched in Firefox’s ETP Strict mode.
Fixed:
Colors in Firefox on macOS will no longer be saturated on wide gamut displays, untagged images are properly treated as sRGB, and colors in images tagged as sRGB will now match CSS colors.
In full screen mode on macOS, moving your mouse to the top of the screen will no longer hide your tabs behind the system menu bar.
Also in full screen mode on macOS, it is now possible to hide the browser toolbars for a fully immersive full screen experience. This brings macOS in line with Windows and Linux.
Various stability and security fixes.
Changed:
Introducing a non-native implementation of web form controls, which delivers a new modern design and some improvements to page load performance. Watch for layout bugs in web pages that make assumptions about the dimensions or styling of form controls.
The screenshots feature is available in the right-click context menu. You can also add a screenshots shortcut to your toolbar.
Developer:
Better keyboard navigation for editable BoxModel properties in the Inspector panel
Web Platform:
The Event Timing API is now supported.
The CSS forced-colors media query is now supported.

New in Firefox 89.0 Beta 1 (Apr 20, 2021)

New in Firefox 88.0 (Apr 19, 2021)

New in Firefox 87.0 (Mar 23, 2021)

New:
You’ll encounter less website breakage in Private Browsing and Strict Enhanced Tracking Protection with SmartBlock, which provides stand-in scripts so that websites load properly.
To further protect your privacy, our new default HTTP Referrer policy will trim path and query string information from referrer headers to prevent sites from accidentally leaking sensitive user data.
The “Highlight All” feature on Find in Page now displays tick marks alongside your scrollbar that correspond to the location of matches found on that page.
We’re proud to announce full support for macOS built-in screen reader, VoiceOver.
We’ve added a new locale: Silesian (szl)
Fixed:
We’ve fixed several significant accessibility issues:
Video controls now have visible focus styling and video and audio controls are now keyboard navigable. (Bug 1681007)
HTML <meter> is now spoken by screen readers. (Bug 1460378)
Firefox now sets a useful initial focus in Add-ons Manager. (Bug 580537)
Firefox will now fire a name/description change event when aria-labelledby/describedby content changes. (Bug 493683)
Various security fixes.
Changed:
To prevent user data loss when filling out forms, we’ve disabled the Backspace key as a navigation shortcut for the back navigation button. To re-enable the Backspace keyboard shortcut, you can change the about:config preference browser.backspace_action to 0. You can also use the recommended Alt + Left arrow (Command + Left arrow on Mac) shortcut instead.
Firefox keyboard shortcuts
We've removed items from the Library menu that weren't used often or have other access points in the browser: Synced tabs, Recent highlights, and Pocket list.
We've simplified the Help menu by reducing redundant items, such as those that point to Firefox support pages that can also be accessed via the Get Help item.
Enterprise:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can see more details in the Firefox for Enterprise 87 Release Notes.
Developer:
Developer Information:
We've greatly simplified the Web Developer menu. Go to Application Menu > Web Developer > Web Developer Tools to access Inspector, Web Console, Debugger, Network Style Error, Performance, Storage Inspector, Accessibility, and Application
Developers can now use the Page Inspector to simulate prefers-color-scheme media queries, without having to change the operating system to light or dark mode.
Developers can now use the Page Inspector to toggle the :target pseudo-class for the currently selected element in addition to the pseudo-classes that were previously supported: :hover, :active and :focus, :focus-within, :focus-visible, and :visited.
There is a number of Page Inspector improvements and bug fixes related to inactive CSS rules:
The table-layout property is now marked as inactive for non-table elements.
The scroll-padding properties (shorthand and longhand) are now marked as inactive for non-scrollable elements.
The text-overflow property was previously incorrectly marked as inactive for some overflow values.

New in Firefox 86.0.1 (Mar 12, 2021)

Fixed:
Fixed an issue on Apple Silicon machines that caused Firefox to be unresponsive after system sleep (bug 1682713)
Fixed an issue causing windows to gain or lose focus unexpectedly (bug 1694927)
Fixed truncation of date and time widgets due to incorrect width calculation (bug 1695578)
Fixed an issue causing unexpected behavior with extensions managing tab groups (bug 1694699)
Fixed a frequent Linux crash on browser launch (bug 1694670)
Changes for web developers:
Developer Tools:
The cd() web console helper function, which was deprecated in Firefox 74, has now been removed. The <iframe> context picker tool described in Working with iframes serves the same purpose, but is much better! For more information see bug 1607741.
The different margin and padding shorthand and longhand properties are now marked as inactive on internal table elements because they have no effect on them. (bug 1551569).
The order property was previously incorrectly marked as inactive for grid items. This got fixed in bug 1579017.
SVG:
SVG filters can now use the <feComposite> element with the lighter operator (bug 1518099). This operator sums the pixels of two source graphics.
CSS:
The :autofill pseudo-class is now enabled, with -webkit-autofill as an alias (bug 1685675) and (bug 1475316).
The list-style-image property now accepts any valid <image> (bug 1685078).
JavaScript:
The Intl.DisplayNames built-in object has been enabled by default. This enables the consistent translation of language, region, and script display names
APIs:
DOM:
Window.name is now reset to an empty string if a tab loads a page from a different domain, and restored if the original page is reloaded (e.g. by selecting the "back" button). This prevents an untrusted page from accessing any information that the previous page might have stored in the property (potentially the new page might also modify such data, which might then be read by the original page if it was reloaded). For more information see bug 1685089.
WebDriver conformance (Marionette):
Updated WebDriver:ElementClick to synthesize a mousemove event before the actual click event (bug 1684002).
Known bugs:
WebDriver commands following a call to WebDriver:SwitchToFrame can fail with a "no such window" error if the frame's content hasn't yet finished loading (bug 1691348).
After a cross-group page navigation, accessing a previously-retrieved element might not always raise a "stale element" error, and can also lead to a "no such element" error. To prevent this, set the marionette.actors.enabled preference to false (bug 1690308).
Removals:
Removed support for the deprecated Marionette:ActionChain and Marionette:MultiAction commands (bug 1683755).
Changes for add-on developers:
Host permissions now grant access to privileged parts of the tabs API (bug 1679688).
focused: false is now ignored when set as an option in a windows.create() call (bug 1253129).

New in Firefox 87.0 Beta 6 (Mar 5, 2021)

New in Firefox 86.0 (Feb 23, 2021)

New in Firefox 85.0.2 (Feb 10, 2021)

New in Firefox 85.0.1 (Feb 7, 2021)

New in Firefox 85.0 (Jan 26, 2021)

New in Firefox 86.0 Beta 1 (Jan 26, 2021)

New in Firefox 84.0.2 (Jan 6, 2021)

New in Firefox 84.0.1 (Dec 23, 2020)

New in Firefox 85.0 Beta 3 (Dec 18, 2020)

New in Firefox 84.0 (Dec 15, 2020)

New in Firefox 83.0 (Nov 17, 2020)

New:
Firefox keeps getting faster as a result of significant updates to SpiderMonkey, our JavaScript engine, you will now experience improved page load performance by up to 15%, page responsiveness by up to 12%, and reduced memory usage by up to 8%. We have replaced part of the JavaScript engine that helps to compile and display websites for you, improving security and maintainability of the engine at the same time.
Firefox introduces HTTPS-Only Mode. When enabled, this new mode ensures that every connection Firefox makes to the web is secure and alerts you when a secure connection is not available. You can enable it in Firefox Preferences.
Pinch zooming will now be supported for our users with Windows touchscreen devices and touchpads on Mac devices. Firefox users may now use pinch to zoom on touch-capable devices to zoom in and out of webpages.
Picture-in-Picture now supports keyboard shortcuts for fast forwarding and rewinding videos: use the arrow keys to move forward and back 15 seconds, along with volume controls. For a list of supported commands see Support Mozilla
When you are presenting your screen on a video conference in Firefox, you will see our improved user interface that makes it clearer which devices or displays are being shared.
Firefox supports AcroForm, which will allow you to fill in, print, and save supported PDF forms and the PDF viewer also has a new fresh look.
Our users in India on the English build of Firefox will now see Pocket recommendations in their new tab featuring some of the best stories on the web. If you don’t see them, you can turn on Pocket articles in your new tab by following these steps.
For the recently released Apple devices built with Apple Silicon CPUs, you can use Firefox 83 and future releases without any change. This release (83) will support emulation under Apple’s Rosetta 2 that ships with macOS Big Sur. We are working toward Firefox being natively-compiled for these CPUs in a future release.
This is a major release for WebRender as we roll out to more Firefox users on Windows 7 and 8 as well as on macOS 10.12 to 10.15.
We’ve improved functionality and design for a number of Firefox search features:
Selecting a search engine at the bottom of the search panel now enters search mode for that engine, allowing you to see suggestions (if available) for your search terms. The old behavior (immediately performing a search) is available with a shift-click.
When Firefox autocompletes the URL of one of your search engines, you can now search with that engine directly in the address bar by selecting the shortcut in the address bar results.
We’ve added buttons at the bottom of the search panel to allow you to search your bookmarks, open tabs, and history.
Fixed:
For users on macOS restoring a session with minimized windows, Firefox now uses much less power and you should see much longer battery life.
Various security fixes
This release also includes a number of accessibility fixes:
Screen reader features which report paragraphs now correctly report paragraphs instead of lines in Google Docs
When reading by word using a screen reader, words are now correctly reported when there is punctuation nearby
The arrow keys now work correctly after tabbing in the picture-in-picture window
Developer:
Developers can use the scroll badge in the Page Inspector to Debug scrollable overflow. Selecting the badge highlights elements that are causing overflow and marks them with the overflow badge
Web Platform:
This release adds support for conic gradients in CSS, helping colors to smoothly transition as you spin around the center, rather than as you progress outward from the center.

New in Firefox 82.0.3 (Nov 9, 2020)

New in Firefox 82.0.2 (Oct 28, 2020)

New in Firefox 82.0.1 (Oct 28, 2020)

New in Firefox 82.0 (Oct 20, 2020)

With this release, Firefox introduces a number of improvements that make watching videos more delightful:
the Picture-In-Picture button has a new look and position, making it easier for you to find and use the feature.
Picture-In-Picture now has a keyboard shortcut for Mac users (Option + Command + Shift + Right bracket) that works before you start playing the video.
For Windows users, Firefox now uses DirectComposition for hardware decoded video, which will improve CPU and GPU usage during video playback, improving battery life.
Firefox is faster than ever with improved performance on both page loads and start up time:
Websites that use flexbox-based layouts load 20% faster than before;
Restoring a session is 17% quicker, meaning you can more quickly pick up where you left off;
For Windows users, opening new windows got quicker by 10%.
You can now explore new articles when you save a webpage to Pocket from the Firefox toolbar.
WebRender continues to roll out to more Firefox users on Windows.
Fixed:
Screen reader features which report paragraphs now correctly report paragraphs in Firefox instead of lines.
Various security fixes:
CVE-2020-15969: Use-after-free in usersctp
CVE-2020-15254: Undefined behavior in bounded channel of crossbeam rust crate
CVE-2020-15680: Presence of external protocol handlers could be determined through image tags
CVE-2020-15681: Multiple WASM threads may have overwritten each others' stub table entries
CVE-2020-15682: The domain associated with the prompt to open an external protocol could be spoofed to display the incorrect origin
CVE-2020-15683: Memory safety bugs fixed in Firefox 82 and Firefox ESR 78.4
CVE-2020-15684: Memory safety bugs fixed in Firefox 82
Changed:
Credit card auto-fill is now more accessible with the card type, and the card number in the card editor now available to screen readers.
Printing dialog errors for invalid form entries are now reported to screen readers.
Developer:
MediaSession API has been enabled by default which allows web authors to provide custom behaviors for standard media playback interactions, giving them more options than ever.
DevTools now shows server side events in the Network panel. This allows a server to send new data to a web page at any time allowing developers to see events they previously couldn't and help with lower-level troubleshooting.

New in Firefox 81.0.2 (Oct 13, 2020)

New in Firefox 81.0.1 (Oct 1, 2020)

New in Firefox 81.0 (Sep 22, 2020)

New:
You can pause and play audio or video in Firefox right from your keyboard or headset, giving you easy access to control your media when in another Firefox tab, another program, or even when your computer is locked.
In addition to our default, dark and light themes, with this release, Firefox introduces the Alpenglow theme: a colorful appearance for buttons, menus, and windows. You can update your Firefox themes under settings or preferences.
For our users in the US and Canada, Firefox can now save, manage, and auto-fill credit card information for you, making shopping on Firefox ever more convenient. To ensure the smoothest experience, this will be rolling out to users gradually.
Firefox supports AcroForm, which will soon allow you to fill in, print, and save supported PDF forms and the PDF viewer also has a new fresh look.
Our users in Austria, Belgium and Switzerland using the German version of Firefox will now see Pocket recommendations in their new tab featuring some of the best stories on the web. If you don’t see them, you can turn on Pocket articles in your new tab by following these steps. In addition to Firefox’s new tab, Pocket is also available as an app on iOS and Android.
Fixed:
Various security fixes.
We’ve fixed a bug for users of language packs where the default language was reset to English after Firefox updates.
Browser native HTML5 audio/video controls received several important accessibility fixes:
Audio/video controls remain accessible to screen readers even when they are temporarily hidden visually.
Audio/video elapsed and total time are now accessible to screen readers where they weren't previously.
Various unlabelled controls are now labelled making them identifiable to screen readers.
Screen readers no longer intrusively report progress information unless the user requests it.
Changed:
You will soon find Picture-in-Picture more easily on all the videos you watch with new iconography.
The bookmarks toolbar is now automatically revealed once bookmarks are imported into Firefox, making it easier to find your most important websites.
We have expanded our supported file types - .xml, .svg, and .webp - so files you’ve downloaded can be opened right in Firefox.
Enterprise:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can see more details in the Firefox for Enterprise 81 Release Notes.
Developer:
TypeScript files are now properly identified in the Debugger panel and labeled with corresponding icons making it easier for you to find these files in the list.
HTTP JSON responses using XSSI prevention characters are properly parsed and JSON data presented in a form of an expandable tree. This allows easy inspection of such HTTP responses through traditional (expandable) tree UI.
It’s possible to pause on script first statement, which is useful e.g. in cases where developers want to debug side effects caused by script execution or timers.
The color vision deficiency simulation in the accessibility panel of Developer Tools is now more accurate. We removed protanomaly, deuteranomaly and tritanomaly and aded achromatopsia.

New in Firefox 80.0.1 (Sep 1, 2020)

Fixed:
Fixed a performance regression when encountering new intermediate CA certificates (bug 1661543)
Fixed crashes possibly related to GPU resets (bug 1627616)
Fixed rendering on some sites using WebGL (bug 1659225)
Fixed the zoom-in keyboard shortcut on Japanese language builds (bug 1661895)
Fixed download issues related to extensions and cookies (bug 1655190)
Changes for web developers:
Developer Tools:
You can now block and unblock network requests using the :block and :unblock helper commands in the Web Console. (Refer to bug 1546394)
When adding a class to an element in the Page Inspector's Rules pane, existing classes are suggested with autocomplete. (Refer to bug 1492797)
When the Debugger breaks on an exception, the tooltip in the source pane now shows disclosure triangle that reveals a stack trace. (Refer to bug 1643633)
In the Network Monitor request list, a turtle icon is shown for "slow" requests that exceed a configurable threshhold for the waiting time. (Refer to bug 1648373)
CSS:
The standard, unprefixed appearance property is now supported; existing -moz-appearance and -webkit-appearance will be the aliases of the unprefixed property (bug 1620467).
JavaScript:
The ECMAScript 2021 export * as namespace syntax for the export statement is now supported (bug 1496852).
HTTP
Previously, when the fullscreen directive was applied to an <iframe> (i.e. via the allow attribute), it didn't work unless the allowfullscreen attribute was also present This has now been fixed (bug 1608358).
APIs:
DOM:
Web Animations API compositing operations are now enabled — see KeyframeEffect.composite and KeyframeEffect.iterationComposite (bug 1652676).
Media, WebRTC, and Web Audio:
The Media Session API now supports the seekto action, allowing media controls to request that your code seek to a specific time offset within the media you're playing (bug 1621403).
The Media Session API also now supports the skipad action, which skips past the current advertising or promotional content to continue playing the main media content, if the capability exists and if the user's subscription or permissions level allows ad skipping (bug 1582569).
WebGL:
The KHR_parallel_shader_compile WebGL extension is now supported (bug 1536674).
Removals:
The outerHeight and outerWidth features of Window.open() are no longer exposed to web content (bug 1623826).
WebAssembly:
Atomic operations are now allowed on non-shared memories (bug 1619196).
WebDriver conformance (Marionette):
Using WebDriver:NewWindow to open a new tab returned too early when running tests in headless mode (bug 1653281).
Removed name argument for WebDriver:SwitchToWindow, which is not supported for W3C-compatible mode, and shouldn't be used anymore (bug 1588424).
Started to add Fission support for the following commands: WebDriver:FindElement, WebDriver:FindElements, WebDriver:GetElementAttribute, WebDriver:GetElementProperty.
Known issue: Opening a new tab by using WebDriver:NewWindow, or by an arbitrary script that calls window.open(), will automatically switch to that new window (bug 1661495).

New in Firefox 80.0 (Aug 30, 2020)

New:
Firefox can now be set as the default system PDF viewer.
The name reported by accessibility tools for items in multi-tiered tree controls no longer incorrectly includes information from items at deeper levels, providing users with the correct level of content when using a screen reader.
Fixed:
Various security fixes.
Several crashes while using a screen reader were fixed including a frequently encountered crash when using the JAWS screen reader.
Firefox Developer Tools received significant fixes allowing screen reader users to benefit from some of the tools that were previously inaccessible.
SVG title and desc elements (labels and descriptions) are now correctly exposed to assistive technology products such as screen readers.
Changed:
For users with reduced motion settings, we’ve reduced a number of animations such as tab loading to reduce motion for users with migraines and epilepsy.
The new add-ons blocklist has been enabled to improve performance and scalability.
Enterprise:
A number of bug fixes and new policies have been implemented in the latest version of Firefox. You can see more details in the Firefox for Enterprise 80 Release Notes.
Today’s release is the final scheduled for Firefox 68 ESR (68.12) unless there is a critical security issue found prior to the release of Firefox ESR 78.3 on September 22, 2020. Users of Firefox 68 ESR will be automatically upgraded to the Firefox 78 ESR series with the release of 78.3.
Developer:
We’ve shipped an experimental sidebar panel in the inspector to Firefox Developer Edition that helps developers more quickly identify potential browser compatibility problems based on MDN data.
In the Network Monitor request list, a turtle icon is shown for "slow" requests that exceed a threshold for the waiting time.
Firefox now supports RTX and Transport-cc for improved call quality in poor network conditions and better bandwidth estimation. These features also provide better compatibility with many websites using WebRTC.

New in Firefox 79.0 (Jul 28, 2020)

New:
We’ve rolled out WebRender to more Windows users with Intel and AMD GPUs, bringing improved graphics performance to an even larger audience.
Firefox users in Germany will now see more Pocket recommendations in their new tab featuring some of the best stories on the web. If you don’t see them, you can turn on Pocket articles in your new tab by following these steps.
Fixed:
Various security fixes.
Several crashes while using a screen reader were fixed, including a frequently encountered crash when using the JAWS screen reader.
Firefox Developer Tools received significant fixes allowing screen reader users to benefit from some of the tools that were previously inaccessible.
SVG title and desc elements (labels and descriptions) are now correctly exposed to assistive technology products such as screen readers.
Enterprise:
A number of bug fixes and new policies have been implemented in the latest version of Firefox. You can see more details in the Firefox for Enterprise 79 Release Notes.
Updates to the password policy allow admins to require a primary password (formerly called master password. Previously the policy could disable the primary password but not force a primary password. Users required to use a primary password will only be asked to create a primary password the first time they try to save a password.
Developer:
Newly added asynchronous call stacks let developers trace their async code through events, timeouts, and promises. The async execution chains are shown in the Debugger’s call stack, but also for stack traces in Console errors and Network initiators.
Erroneous network responses with 4xx/5xx status codes display as errors in the Console, making it easy to understand them in the context of related logs. The request/response details can be expanded or resent for quick debugging.
JavaScript errors are now visible not only in the Console, but also in the Debugger. The relevant line of code will be highlighted and display error details on hover.
Opening SCSS and CSS-in-JS sources from the Inspector now works more reliably thanks to improved source map handling across all panels.
Inspecting accessibility properties from the browser context menu is now available to all users by default.

New in Firefox 79.0 Beta (Jul 16, 2020)

New in Firefox 78.0.2 (Jul 16, 2020)

New in Firefox 78.0.1 (Jul 2, 2020)

New in Firefox 78.0 (Jun 30, 2020)

New:
The Protections Dashboard includes consolidated reports about tracking protection, data breaches, and password management. New features let you:
Track how many breaches you’ve resolved right from the dashboard
See if any of your saved passwords may have been exposed in a data breach
To view your dashboard, type about:protections into the address bar, or select “Protections Dashboard” from the main menu.
Because we know people try to fix problems by reinstalling Firefox when a simple refresh is more likely to solve the issue, we’ve added a Refresh button to the Uninstaller.
With this release, your screen saver will no longer interrupt WebRTC calls on Firefox, making conference and video calling in Firefox better.
We’ve rolled out WebRender to Windows users with Intel GPUs, bringing improved graphics performance to an even larger audience.
Firefox 78 is also our Extended Support Release (ESR), where the changes made over the course of the previous 10 releases will now roll out to our ESR users. Some of the highlights are:
Kiosk mode
Client certificates
Service Worker and Push APIs are now enabled
The Block Autoplay feature is enabled
Picture-in-picture support
View and manage web certificates in about:certificate
Pocket recommendations, featuring some of the best stories on the web, will now appear on the Firefox new tab for 100% of our users in the UK. If you don’t see them, you can turn on Pocket articles in your new tab, follow these steps.
Fixed:
Various security fixes.
We fixed bugs in the search results quality composition and improved search result texts based on recommendations by our partners.
Changed:
The minimal system requirements on Linux have been updated. Firefox now needs GNU libc 2.17, libstdc++ 4.8.1 and GTK+ 3.14 or newer versions.
As part of our ongoing effort to deprecate obsolete cryptography, we have disabled all remaining DHE-based TLS ciphersuites by default.
To mitigate web compatibility issues from disabling DHE-based TLS ciphersuites, Firefox 78 enables two more AES-GCM SHA2-based ciphersuites.
We have disabled TLS 1.0 and TLS 1.1 to improve your website connections. Sites that don't support TLS version 1.2 will now show an error page.
The context menu (accessed by right clicking on a tab) lets you undo multiple tab closings with a single click and places Close Tabs to the Right and Close Other Tabs in a submenu.
A number of accessibility improvements have been made with this release:
When using the JAWS screen reader, pressing the down arrow in an HTML input control with a datalist no longer incorrectly moves the cursor to the next element after the input control.
Screen readers no longer severely lag or freeze when focusing the microphone/camera/screen sharing indicator.
Large tables with thousands of rows now load much faster for screen reader users.
Text input controls with custom styling now correctly show the focus outline when appropriate.
Screen readers no longer sometimes incorrectly switch to document browsing mode unexpectedly when the user enters the main Developer Tools window.
We reduced a number of animations such as tab hover, search bar expansion, and others to reduce motion for users with migraines and epilepsy.
Enterprise:
Enable support for client certificates stored on macOS and Windows by setting the experimental preference security.osclientcerts.autoload to true.
New policies allow you to configure application handlers, disable picture in picture, and require a master password, which will be renamed to ‘primary password’ in future releases.
Developer:
DevTools Console now logs uncaught promise errors with much more detailed names, stacks, and properties, particularly improving JavaScript framework debugging.
Debugger’s automatic mapping for minified variable names now also works for Logpoints, which makes debugger of source-mapped projects feel more seamless.
The Firefox DevTools’ Network panel now highlights which extension or CORS restriction blocked a request, so developers can make their sites more resilient and secure.
New RegExp engine in SpiderMonkey, adding support for the dotAll flag, Unicode escape sequences, lookbehind references, and named captures.

New in Firefox 77.0.1 (Jun 3, 2020)

New in Firefox 77.0 (Jun 3, 2020)

New in Firefox 76.0.1 (May 10, 2020)

New in Firefox 76.0 (May 5, 2020)

New:
With today’s release, Firefox strengthens protections for your online account logins and passwords, with innovative approaches to managing your accounts during this critical time
Firefox displays critical alerts in the Lockwise password manager when a website is breached;
If one of your accounts is involved in a website breach and you've used the same password on other websites, you will now be prompted to update your password. A key icon identifies which accounts use that vulnerable password.
Automatically generate secure, complex passwords for new accounts across more of the web that are easily saved right in the browser;
You have been able to access and see your saved passwords under Logins and Passwords easily under the main menu. If your device happens to be shared among your family or roommates, the latest update helps to prevent casual snooping over your shoulder. If you don’t have a master password set up for Firefox, Windows and macOS now requires a login to your operating system account before showing your saved passwords.
Picture-in-Picture allows you to multitask, the small video window following along no matter what you are doing on your computer, across different applications and even workspaces. Now, when you are ready to focus on the video, a double click can take the small window into full screen. Double click again to reduce the size again.
Firefox now supports Audio Worklets that will allow more complex audio processing like VR and gaming on the web; and is being adopted by some of your favorite software programs.
With this change, you can now join Zoom calls on Firefox without the need for any additional downloads.
WebRender continues its roll out to more Firefox for Windows users, now available by default on modern Intel laptops with a small screen (<= 1920x1200) for improved graphics rendering.
Fixed:
Various security fixes
Changed:
Two updates to the address bar improve its usability and visibility:
The shadow around the address bar field is reduced in width when a new tab is opened;
The bookmarks toolbar has expanded slightly in size to improve its surface area for touchscreens.
Developer:
Testing mobile interactions using DevTools’ Responsive Design Mode now mimics the device behavior for handling double-tap to zoom. This builds on previous improvements to correctly rendering meta-viewport tags, allowing developers to optimize their sites for Firefox for Android without a device.
Double-clicking table headers in DevTools’ network request table now resizes the column width to fit the content, making it easier to expand the important data.
WebSocket inspection now supports ActionCable message preview, adding to the list of automatically formatted protocols like socket.io, SignalR, WAMP, etc.

New in Firefox 75.0 (Apr 7, 2020)

New in Firefox 75.0 Beta (Apr 6, 2020)

New in Firefox 74.0 (Mar 11, 2020)

New:
Your login management has improved with the ability to reverse alpha sort (Name Z-A) in Lockwise, which you can access under Logins and Passwords.
Firefox now makes importing your bookmarks and history from the new Microsoft Edge browser on Windows and Mac simple.
Add-ons installed by external applications can now be removed using the Add-ons Manager (about:addons). Going forward, only users can install add-ons; they cannot be installed by an application.
Facebook Container prevents Facebook from tracking you around the web - Facebook logins, likes, and comments are automatically blocked on non-Facebook sites. But when we need an exception, you can now create one by adding custom sites to the Facebook Container.
Firefox now provides better privacy for your web voice and video calls through support for mDNS ICE by cloaking your computer’s IP address with a random ID in certain WebRTC scenarios.
Security fixes:
CVE-2020-6805: Use-after-free when removing data about origins
CVE-2020-6806: BodyStream::OnInputStreamReady was missing protections against state confusion
CVE-2020-6807: Use-after-free in cubeb during stream destruction
CVE-2020-6808: URL Spoofing via javascript: URL
CVE-2020-6809: Web Extensions with the all-urls permission could access local files
CVE-2020-6810: Focusing a popup while in fullscreen could have obscured the fullscreen notification
CVE-2020-6811: Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
CVE-2019-20503: Out of bounds reads in sctp_load_addresses_from_init
CVE-2020-6812: The names of AirPods with personally identifiable information were exposed to websites with camera or microphone permission
CVE-2020-6813: @import statements in CSS could bypass the Content Security Policy nonce feature
CVE-2020-6814: Memory safety bugs fixed in Firefox 74 and Firefox ESR 68.6
CVE-2020-6815: Memory and script safety bugs fixed in Firefox 74
We have fixed issues involving pinned tabs such as being lost. You should also no longer see them reorder themselves.
Changed:
When a video is uploaded with a batch of photos on Instagram, the Picture-in-Picture toggle would sit atop of the “next” button. The toggle is now moved allowing you to flip through to the next image of the batch.
On Windows, Ctrl+I can now be used to open the Page Info window instead of opening the Bookmarks sidebar. Ctrl+B still opens the Bookmarks sidebar making keyboard shortcuts more useful for our users.
We have disabled TLS 1.0 and TLS 1.1 to improve your website connections. Sites that don't support TLS version 1.2 will now show an error page.
Developer:
Firefox’s Debugger added support for debugging Nested Web Workers, so their execution can be paused and stepped through with breakpoints
Web Platform:
Firefox has added support for the new JavaScript optional chaining operator (?.) and CSS text-underline-position.

New in Firefox 73.0.1 (Feb 19, 2020)

New in Firefox 73.0 (Feb 18, 2020)

New:
Today’s Firefox release includes two features that help users view and read website content more easily, quickly. Like all accessibility improvements, these features improve browsing for everyone.
Firefox has offered a page zoom feature for more than a decade that allows users to set the zoom level on a per-site basis. For users who need to zoom most websites, having to adjust zoom for each new site can be an annoyance. To address this, we have implemented a new global default zoom level setting. This option is available in about:preferences under "Language and Appearance" and can be scaled up or down from 100% as needed and sets the default zoom level for all sites. Per-site zoom is still available to make adjustments to individual sites as needed.
Many users with low vision rely on Windows' High Contrast Mode to make websites more readable. Traditionally, to increase the readability of text, Firefox has disabled background images when High Contrast Mode is enabled. With today’s release of Firefox 73, we introduce a “readability backplate” solution which places a block of background color between the text and background image. Now, websites in High Contrast Mode are more readable without disabling background images.
Fixed:
Various security fixes.
Improved audio quality when playing back audio at a faster or slower speed.
Firefox will now only prompt you to save logins if a field in a login form was modified.
Changed:
WebRender rollout has been expanded to include Windows 10 laptops running NVIDIA graphics cards with drivers newer than 432.00 and screen sizes smaller than 1920x1200.
Developer:
WAMP-formatted WebSocket messages (JSON, MsgPack and CBOR) are now nicely decoded for inspection in the Network panel.
Web Platform:
Improved auto-detection of legacy text encodings on old web pages which don’t explicitly declare the text encoding.
Unresolved:
Users with 0patch security software may encounter crashes at startup after updating to Firefox 73. This will be fixed in a future Firefox release. As a workaround, an exclusion for firefox.exe can be added within the 0patch settings.

New in Firefox 72.0.1 (Jan 9, 2020)

New in Firefox 72.0 (Jan 8, 2020)

New in Firefox 71.0 (Dec 4, 2019)

New:
Improvements to Lockwise, our integrated password manager:
Firefox now recognizes subdomains and will autofill domain logins from Lockwise
Integrated breach alerts from Firefox Monitor are now available to users with screen readers
More information about Enhanced Tracking Protection in action:
Notifications when Firefox blocks cryptominers
A running tally of blocked trackers in the protection panel accessed by clicking the address bar shield
Picture-in-picture video comes to Firefox for Windows: Select the blue icon from the right edge of a video to pop open a floating window so you can keep watching while working in other tabs. Learn how the feature works.
Native MP3 decoding on Windows, Linux, and macOS
Fixed:
Various security fixes.
Changed:
Configuration page (about:config) reimplemented in HTML
Firefox will now ship with Catalan (Valencian) (ca-valencia), Tagalog (tl), and Triqui (trs)
Enterprise:
New kiosk mode functionality, which allows maximum screen space for customer-facing displays
Developer:
New videos every week on the Mozilla Developer YouTube channel
Improvements to the website certificate viewer, with more features and more detailed information
Improvements to the extensions downloads API for handling download failures
Extension popup windows now include the extension name instead of its moz-extension:// url when using the windows.create API
Extension-registered devtools panels now interact better with screen readers
Added support for developers, including:
DevTools’ Network panel can now inspect WebSocket messages and automatically formats a variety of framework formats
Console’s new multi-line editor mode provides an IDE-like experience that makes it convenient to iterate on longer code snippets
The Network panel’s new resource blocking can simulate the impact of tracking protection, security, service outages, and bad connectivity for more robust testing
More features and improvements can be found every release in DevTools’ “What’s New” panel in en-US

New in Firefox 70.0.1 (Dec 3, 2019)

New in Firefox 70.0 (Oct 24, 2019)

NEW:
More privacy protections from Enhanced Tracking Protection:
Social tracking protection, which blocks cross-site tracking cookies from sites like Facebook, Twitter, and LinkedIn, is now a standard feature of Enhanced Tracking Protection.
The Privacy Protections report shows an overview, with details, of the trackers Firefox has blocked. It provides consolidated reports from Monitor and Lockwise.
More security protections from Firefox Lockwise, our digital identity and password management tool:
Lockwise for desktop lets you create, update, and delete your logins and passwords to sync across all your devices, including the Lockwise mobile apps and Firefox mobile browsers .
Integrated breach alerts from Firefox Monitor, to alert you when saved logins and passwords are compromised in online data breaches.
Complex password generation, to help you create and save strong passwords for new online accounts.
Improvements to core engine components, for better browsing on more sites:
A faster Javascript Baseline Interpreter to handle the modern web’s
large codebases and improve page load performance by as much as 8
percent.
WebRender rolled out to more Firefox for Windows users, now available by default on Windows desktops with integrated Intel graphics cards and resolution of 1920x1200 or less) for improved graphics rendering.
Compositor improvements in Firefox for macOS that reduce power
consumption, speed up page load by as much as 22 percent, and reduce resource use for video by up to 37 percent.
More browser features to help you get the most out of Firefox products and services:
A stand-alone Firefox account menu for easy access to Firefox services like Monitor and Send.
A message panel accessed from the gift icon in the toolbar that offers a quick overview of new releases and key features.
When a website uses your geolocation, an indicator is shown in the
address bar.
CHANGED:
Built-in Firefox pages now follow the system dark mode preference
Aliased theme properties have been removed, which may affect some themes
Passwords can now be imported from Chrome on macOS in addition to existing support for Windows
Readability is now greatly improved on under- or overlined texts, including links. The lines will now be interrupted instead of crossing over a glyph.
Improved privacy and security indicators:
A new crossed-out lock icon will indicate sites delivered via
insecure HTTP
The formerly green lock icon is now grey
The Extended Validation (EV) indicator has been moved to the identity
popup that appears when clicking the lock icon
DEVELOPER:
The Developer Tools Accessibility panel now includes an audit for keyboard accessibility and a color deficiency simulator for systems with WebRender enabled
Inactive CSS: The Inspector now grays out CSS declarations that don’t affect the selected element and shows a tooltip explaining why -- and even how to fix it.
The new DOM Mutation Breakpoints in Developer Tools allows developers to diagnose when scripts add, remove or update page content. This makes debugging of complex script interactions and dependencies a lot easier.
WebExtensions developers can now inspect browser.storage.local data using the "Addon Debugging" Firefox Developer Tools.
With new network resource search in Developer Tools, you can quickly find resources based on their request and response data, including headers, cookies and content.
VARIOUS SECURITY FIXES:
CVE-2018-6156: Heap buffer overflow in FEC processing in WebRTC
CVE-2019-15903: Heap overflow in expat library in XML_GetCurrentLineNumber
CVE-2019-11757: Use-after-free when creating index updates in IndexedDB
CVE-2019-11759: Stack buffer overflow in HKDF output
CVE-2019-11760: Stack buffer overflow in WebRTC networking
CVE-2019-11761: Unintended access to a privileged JSONView object
CVE-2019-11762: document.domain-based origin isolation has same-origin-property violation
CVE-2019-11763: Incorrect HTML parsing results in XSS bypass technique
CVE-2019-11765: Incorrect permissions could be granted to a website
CVE-2019-17000: CSP bypass using object tag with data: URI
CVE-2019-17001: CSP bypass using object tag when script-src 'none' is specified
CVE-2019-17002: upgrade-insecure-requests was not being honored for links dragged and dropped
CVE-2019-11764: Memory safety bugs fixed in Firefox 70 and Firefox ESR 68.2

New in Firefox 69.0.3 (Oct 11, 2019)

New in Firefox 69.0.2 (Oct 4, 2019)

New in Firefox 69.0 (Sep 18, 2019)

New:
Enhanced Tracking Protection (ETP) rolls out stronger privacy protections:
The default standard setting for this feature now blocks third-party tracking cookies and cryptominers.
The optional strict setting blocks fingerprinters as well as the items blocked in the standard setting.
The Block Autoplay feature is enhanced to give users the option to block any video that automatically starts playing, not just those that automatically play with sound.
For our users in the US or using the en-US browser, we are shipping a new “New Tab” page experience that connects you to the best of Pocket’s content.
Support for the Web Authentication HmacSecret extension via Windows Hello now comes with this release, for versions of Windows 10 May 2019 or newer, enabling more passwordless experiences on the web.
Support for receiving multiple video codecs with this release makes it easier for WebRTC conferencing services to mix video from different clients.
For our users on Windows 10, you’ll see performance and UI improvements:
Firefox will give Windows hints to appropriately set content process priority levels, meaning more processor time spent on the tasks you're actively working on, and less processor time spent on things in the background (with the exception of video and audio playback).
For our existing Windows 10 users, you can easily find and launch Firefox from a shortcut on the Win10 taskbar.
For our users on macOS, battery life and download UI are both improved:
macOS users on dual-graphics-card machines (like MacBook Pro) will switch back to the low-power GPU more aggressively, saving battery life.
Finder on macOS now displays download progress for files being downloaded.
JIT support comes to ARM64 for improved performance of our JavaScript Optimizing JIT compiler.
Fixed:
Various security fixes
Changed:
As previously announced in the Plugin Roadmap for Firefox, the "Always Activate" option for Flash plugin content has been removed. Firefox will now always ask for user permission before activating Flash content on a website.
With the deprecation of Adobe Flash Player, there is no longer a need to identify users on 32-bit version of the Firefox browser on 64-bit version operating systems reducing user agent fingerprinting factors providing greater level of privacy to our users as well as improving the experience of downloading other apps.
Firefox no longer loads userChrome.css or userContent.css by default improving start-up performance. Users who wish to customize Firefox by using these files can set the toolkit.legacyUserProfileCustomizations.stylesheets preference to true to restore this ability.
Enterprise:
For Enterprise system administrators that manage macOS computers, we begin shipping a Mozilla signed PKG installer to simplify your deployments.
Developer:
For our mobile web developers, we have migrated remote debugging from the old WebIDE into a re-designed about:debugging, making debugging GeckoView on remote devices via USB rock solid.
The network panel will now show blocked resources to allow developers to best understand the impact of content blocking and ad blocking extensions given our ongoing expansion of Enhanced Tracking Protection to all users with this release.
The new event listener breakpoint feature allows developers to pause on a host of different event types, whether it be related to animations, DOM, media, mouse, touch, worker, and many other event types.
Firefox Developer Tools now offers an audit for the presence of text alternatives for non-text content, the a11y panel checks toolbar has been augmented to better help developers adhere to WCAG Guideline 1.1.

New in Firefox 68.0.2 (Aug 16, 2019)

New in Firefox 68.0.1 (Jul 19, 2019)

New in Firefox 68.0 (Jul 12, 2019)

New:
Dark mode in reader view expands so that windows are also dark on the controls, sidebars and toolbars.
Cryptomining and fingerprinting protections are added to strict content blocking settings in Privacy & Security preferences.
WebRender will roll out to Windows 10 users with AMD graphics cards.
Windows Background Intelligent Transfer Service (BITS) update download support, which allows Firefox update downloads to continue when Firefox is closed.
Improved extension security and discovery:
New reporting feature in about:addons allows you to report security and performance issues with extensions and themes.
Redesigned extensions dashboard in about:addons provides easy access to information about your extensions, including data and settings access required by each extension.
Find high quality, secure extensions via the Recommended Extensions program in about:addons, which now displays user count and ratings for each extension. "Recommended” badges for these extensions also appear on AMO. More extensions will be added over time.
Fixed:
Various security fixes
Local files can no longer access other files in the same directory.
Changed:
Unified existing locales (bn-BD, bn-IN) under a single Bengali (bn) localization.
The following unmaintained translations have been removed: Assamese (as), English - South Africa (en-ZA), Maithili (mai), Malayalam (ml), Odia (or). Existing users will be migrated to the British English (en-GB) version.
When an HTTPS error caused by antivirus software is detected, Firefox will attempt to automatically fix it
Camera and microphone access now require an HTTPS connection.
The way non-default preferences are synced has changed. Please see this support article for more details
Enterprise:
For all operating systems, we have a number of additional policies including:
New tab page configuration and disabling
Local file links
Download behavior
Search suggestions
Managed storage for using policies in Webextensions
Extension whitelisting and blacklisting by ID and website
A subset of commonly used Firefox preferences
Developer:
Firefox Developer Tools now offers a full page color contrast audit that identifies all elements on a page that fail color contrast checks.
Added about:compat, where website-specific workarounds are listed and may be toggled. These workarounds are meant as temporary fixes for various forms of website breakage for Firefox, while the website fixes them in due time. With about:compat, it is now easy to see all of the workarounds that are active in Firefox, and easy for website developers to disable a given workaround for testing purposes.
Introduces CSS Scroll Snap module that enforces scroll snap positions.

New in Firefox 67.0.3 (Jun 19, 2019)

New in Firefox 68.0 Beta 11 (Jun 18, 2019)

Added about:compat, where website-specific workarounds are listed and may be toggled. These workarounds are meant as temporary fixes for various forms of website breakage for Firefox, while the website fixes them in due time. With about:compat, it is now easy to see all of the workarounds that are active in Firefox, and easy for website developers to disable a given workaround for testing purposes.
When an HTTPS error caused by antivirus software is detected, Firefox will attempt to automatically fix it
New reporting feature in about:addons allows you to easily report security and performance issues with extensions and themes
Find high quality, secure extensions via the Recommended Extensions program. Look for these vetted extensions in about:addons
WebRender is being enabled on Windows 10 desktops with AMD graphics
Access your Firefox Account settings from the hamburger menu
Added a Firefox shortcut in the Windows 10 taskbar for new installations
Preloading of intermediate TLS certificates is enabled in early beta builds, which avoids error pages in cases of server misconfiguration
Properly support BT601, BT709 and BT2020/2100 colorspaces on all platforms
In addition to providing color contrast information for individual elements of a page, Firefox now offers a full page color contrast audit that identifies all element on a page that fail color contrast checks.
Changed:
Unified existing locales (bn-BD, bn-IN) under a single Bengali (bn) localization.
Removed unmaintained languages: Assamese (as), English - South Africa (en-ZA), Maithili (mai), Malayalam (ml), Odia (or). Existing users are migrated to the British English (en-GB) version of Firefox.
The AwesomeBar has been rewritten using Web Technologies only (HTML, JS and CSS). Differences include that results that overflow now have a nice fading effect instead of an ellipsis, and removing history items from the results now requires a different key combination on both Windows and Linux: Shift+DEL or Shift+Backspace

New in Firefox 67.0 (May 31, 2019)

New:
Users can block known cryptominers and fingerprinters in the Custom settings of their Content Blocking preferences.
Keyboard accessibility has improved in the latest version of Firefox. Toolbar and toolbar overflow menu are both fully keyboard accessible: keyboard users can now access add-ons, the downloads panel, the overflow, Page actions and Firefox menus, and much more.
Firefox will now protect you against running older versions of the browser which can lead to data corruption and stability issues
Firefox is upgrading to the newer, higher performance, AV1 decoder known as ‘dav1d’
WebRender is gradually enabled by default on Windows 10 desktops with NVIDIA graphics cards
Mozilla’s highest performing JavaScript compiler now supports ARM64 Windows devices.
Enable FIDO U2F API, and permit registrations for Google Accounts
Some users will see experiments with an improved Pocket experience in Firefox Home with different layouts and more topical content.
Firefox 67 demonstrates improved performance thanks to a number of changes such as:
Lowering priority of setTimeout during page load
Delayed component initialization until after start up
Painting sooner during page load but less often
Suspending unused tabs
Private Browsing sees both usability and security improvements:
Save passwords in private browsing mode
Choose which extensions to exclude from private tabs
A myriad of new features help make Firefox easier to use:
We’ve added a toolbar menu for your Firefox Account to provide more transparency for when you are synced, sharing data across devices and with Firefox. Personalize the appearance of the menu with your own avatar
Tabs can now be pinned from the Page Actions menu in the address bar
Firefox will highlight useful features (like Pin Tabs) when users are most likely to benefit from them.
Easier access to your list of saved logins from the main menu and login autocomplete. Learn about all the ways you can manage your passwords in Firefox.
The Import Data from Another Browser feature is now also available from the File menu
Users will be able to run different Firefox installs side by side by default so that you can run the beta and release versions simultaneously
Fixed:
Various security fixes
Changed:
Firefox no longer supports handling webcal: links with 30boxes.com
Change to extensions in Private Windows: Any new extensions you add to the browser won’t work in Private Windows unless you allow this in the settings.
Users will no longer be able to upload and share screenshots through the Firefox Screenshots server. Users who want to keep existing screenshots need to export them before the server shuts down in the coming months.
Included Twemoji Mozilla font updated to support Emoji 11.0
Font and date adjustments to accommodate the new Reiwa era in Japan

New in Firefox 66.0.5 (May 8, 2019)

New in Firefox 66.0.4 (May 6, 2019)

New in Firefox 66.0.3 (May 6, 2019)

New in Firefox 66.0.2 (May 6, 2019)

New in Firefox 67.0b12 Beta (Apr 19, 2019)

New in Firefox 67.0b9 Beta (Apr 8, 2019)

New in Firefox 66.0.1 (Mar 22, 2019)

New in Firefox 66.0 (Mar 22, 2019)

New:
Firefox now prevents websites from automatically playing sound. You can add individual sites to an exceptions list or turn blocking off. To learn more about block autoplay, which will be rolled out gradually to all users, visit the Mozilla blog.
Smoother scrolling: Scroll anchoring keeps content from jumping as images and ads load at the top of the page
Redesigned certificate error pages help you better understand and resolve issues, including identification of certificate issuers for anti-virus software
Added basic support for macOS Touch Bar
Experimenting with an improved Pocket experience in New Tab with different layouts and more topical content
Improved performance and reduced crash rates by doubling web content loading processes from 4 to 8
Easier, passwordless security: Added support for Windows Hello on Windows 10, allowing you to use your face, fingerprint, or external security keys for website authentication
Enabled AV1 support on 32-bit Windows and MacOS. Firefox now supports the next-generation, royalty-free video compression technology called AV1. Read about Mozilla’s contribution to this new open standard.
Improved search experience:
Find a specific webpage faster when you have a lot of tabs open: You can now search within all of your open tabs from the tab overflow menu
Easier search via a redesigned new tab in Private Windows
Improved performance and better user experience for extensions:
Extensions now store their settings in a Firefox database, rather than individual JSON files, making every site you visit faster
A redesigned keyboard shortcuts section in about:addons makes it easier to view and adjust default shortcuts
Fixed:
The Dark and Light Firefox themes now override the system setting for title bar accent color on Windows 10
Linux users: Resolved an issue that caused Firefox to freeze when downloading files
Various security fixes
Changed:
System title bar is hidden by default to match Gnome guideline for Linux users
Developer:
DevTools Inspector is now fully usable when the Debugger is paused
Lowered priority of setTimeout and setInterval during page load to improve overall page load performance
Fixed: <button> element is no longer special cased in event dispatch, per latest specifications

New in Firefox 65.0.1 (Feb 12, 2019)

New in Firefox 64.0.2 (Jan 10, 2019)

New in Firefox 64.0 (Dec 13, 2018)

New:
Better recommendations: You may see suggestions in regular browsing mode for new and relevant Firefox features, services, and extensions based on how you use the web (for US users only)
Enhanced tab management: You can now select multiple tabs from the tab bar and close, move, bookmark, or pin them quickly and easily
Easier performance management: The new Task Manager page found at about:performance lets you see how much energy each open tab consumes and provides access to close tabs to conserve power
Improved performance for Mac and Linux users, by enabling link time optimization (Clang LTO). (Clang LTO was enabled for Windows users in Firefox 63.)
More seamless sharing on Windows: Windows users can now share web pages using the native sharing experience. You can access Share in the Page Actions menu
Added option to remove add-ons using the context menu on their toolbar buttons
New for enterprise users: Updated the policy engine on macOS to allow using configuration profiles to customize Firefox for enterprise deployments
Changed:
RSS feed preview and live bookmarks are available only via add-ons
TLS certificates issued by Symantec are no longer trusted by Firefox. Website operators are strongly encouraged to replace any remaining Symantec TLS certificates as soon as possible.
about:crashes has been redesigned to make it clear when a crash is being submitted to Mozilla, as well as being clear that removing crashes locally does not remove them from crash-stats.mozilla.com
The macOS keyboard shortcut to add "www" and ".com" to a URL is now ctrl-enter instead of ⌘[cmd]-enter
Security fixes:
CVE-2018-12407: Buffer overflow with ANGLE library when using VertexBuffer11 module
CVE-2018-17466: Buffer overflow and out-of-bounds read in ANGLE library with TextureStorage11
CVE-2018-18492: Use-after-free with select element
CVE-2018-18493: Buffer overflow in accelerated 2D canvas with Skia
CVE-2018-18494: Same-origin policy violation using location attribute and performance.getEntries to steal cross-origin URLs
CVE-2018-18495: WebExtension content scripts can be loaded in about: pages
CVE-2018-18496: Embedded feed preview page can be abused for clickjacking
CVE-2018-18497: WebExtensions can load arbitrary URLs through pipe separators
CVE-2018-18498: Integer overflow when calculating buffer sizes for images
CVE-2018-12406: Memory safety bugs fixed in Firefox 64
CVE-2018-12405: Memory safety bugs fixed in Firefox 64 and Firefox ESR 60.4
Developer:
You may now overlay multiple CSS grids at the same time (up to 3) in the CSS Grid Inspector
The Web Console's command line now highlights JavaScript syntax
When hovering over elements in the Accessibility panel, the contrast ratio of text against background is now indicated
Added support for the new CSS scrollbar specification
WebVR is now available on macOS

New in Firefox 63.0.1 (Nov 1, 2018)

New in Firefox 64.0 Beta 3 (Oct 23, 2018)

New in Firefox 63.0 (Oct 23, 2018)

New:
Performance and visual improvements for Windows users
Moved the build infrastructure of Firefox on Windows to the Clang toolchain, bringing important performance gains
Firefox theme now matches the Windows 10 OS Dark and Light modes
Performance improvements for macOS users
Improved reactivity
Faster tab switching
WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems
Added content blocking, a collection of Firefox settings that offer users greater control over technology that can track them around the web. In 63, users can opt to block third-party tracking cookies or block all trackers and create exceptions for trusted sites that don’t work correctly with content blocking enabled.
WebExtensions now run in their own process on Linux
Firefox now warns about having multiple windows and tabs open when quitting from the main menu
Firefox now recognizes the operating system accessibility setting for reducing animation
Added search shortcuts for Top Sites: Amazon and Google appear as Top Sites tiles on the Firefox Home (New Tab) page. When selected these tiles will change focus to the address bar to initiate a search. Currently in US only.
Fixed:
Resolved an issue that prevented the address bar from autofilling bookmarked URLs in certain cases
Changed:
In the Library, the Open in Sidebar feature for individual bookmarks was removed
The option to Never check for updates was removed from about:preferences. You can use the DisableAppUpdate enterprise policy as a substitute.
The Ctrl+Tab shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order. This new default behavior is activated only in new profiles and can be changed in preferences.
Developer:
Refreshed visual style of Developer Tools menus to improve navigation and consistency
The Dev Tools accessibility inspector is now enabled by default. This tool surfaces information exposed to assistive technologies on the current page, allowing you to check what’s missing or otherwise needs attention.
Added support for Web Components custom elements and shadow DOM
The inspector now ships with a Font Editor that allows you to control non-variable as well as variable fonts

New in Firefox 62.0.3 (Oct 23, 2018)

New in Firefox 62.0.2 (Oct 23, 2018)

New in Firefox 63.0 Beta (Sep 11, 2018)

New:
On macOS, WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems
Improved Windows 10 integration: your Firefox theme now matches your OS Dark / Light mode
WebExtensions now run in their own process on Linux
Faster tab switching in the majority of cases for our macOS users
Improved the reactivity of Firefox on macOS
Changed:
In the Library, the Open in Sidebar feature for individual bookmarks was removed
Never check for updates option removed from about:preferences. If a substitute is needed, we recommend using the DisableAppUpdate enterprise policy
Firefox now warns about having multiple windows/tabs open when quitting from the main menu.
The Ctrl+Tab shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order. This new default behavior is activated only in new profiles and can be changed in your preferences
The build infrastructure of Firefox on Windows moved to the Clang tool chain, bringing important performance gains
Changes for web developers:
Developer tools:
The Fonts tab in the Page Inspector now includes an editor that makes it easy to view and edit the settings of the fonts on your page.
Removals. HTML:
Support for the <img> element's decoding attribute has been added (bug 1416328)
Removals. CSS:
Support for the :defined pseudo-class has been added.
Support for row-gap, column-gap and gap has been added in Flexbox layout (bug 1398483).
Re-enabled support for webkit-prefixed pixel-density @media queries.
Firefox now supports the CSS Flexible Box Layout (Flexbox) properties align-self, align-content, and align-items as well as the justify-content property (bug 1472843).
Implemented path() function for offset-path (bug 1429298).
Implemented syntax improvements from the Media Queries Level 4 specification (bug 1472843).
Swapped values of 2-value overflow syntax so block is first and inline is second (bug 1481866).
Renamed offset-* properties to inset-block-start, inset-block-end, inset-inline-start, and inset-inline-end (bug 1464782).
Added support for the prefers-reduced-motion media feature (bug 1365045).
Added flow relative values (block, inline) for the resize property (bug 1464786).
Implemented flexbox layout for safe & unsafe values in align-self, align-content, and justify-content (bug 1297774).
The logical properties (where appropriate) are now animatable (bug 1309752).
Removals:
Removed offset-block-start, offset-block-end, offset-inline-start and offset-inline-end; these have been renamed as described above (bug 1464782).
SVG:
No changes
Removals. JavaScript:
The Symbol.prototype.description property has been implemented (bug 1472170).
The Object.fromEntries method has been added (bug 1469019).
Removals:
Experimental WebAssembly Module IndexedDB serialization support has been removed (bug 1469395).
APIs. New APIs:
The Shadow DOM (bug 1471947) and Custom Elements (bug 1471948) APIs have been enabled by default; See Web components for more details.
The Media Capabilities API been implemented.
The Async Clipboard API has been implemented and enabled by default for all channels. As is the case with Chrome, Firefox currently implements only the writeText() and readText() methods; however, unlike Chrome, readText() is only available in browser extensions.
The SecurityPolicyViolationEvent interface is now supported. It allows sending events when the Content-Security-Policy is violated (bug 1472661).
APIs. DOM:
The following portions of the Web Animations API have been enabled by default:
The Animation properties ready and finished, specifying the Animation object's ready and finished Promises.
The Animation object's effect property.
The interfaces KeyframeEffect and AnimationEffect.
The Element.toggleAttribute() method has been implemented (bug 1469592).
The Payment Request API paymentmethodchange event has been implemented, along with its implementing PaymentMethodChangeEvent interface. This event is sent to PaymentRequest objects when changes are made to the payment method selected within the current payment handler, such as when the user selects a different credit card to use when paying by Apple Pay (bug 1468356).
The obsolete and non-standard Firefox-only methods Window.back() and Window.forward() have been removed. Please use the window.history.back() and window.history.forward() methods instead (bug 1479486).
Firefox now supports the asynchronous clipboard methods Clipboard.readText() and Clipboard.writeText(). The read() and write() methods have also been implemented but currently work exactly the same as their text-only counterparts (bug 14614645).
The historical, previously non-standard, Event.returnValue property is now supported by Firefox for compatibility purposes (bug 1452569).
Implemented the Window.event property to improve web compatibility, now that it's become standard (bug 218415).
To bring Firefox into alignment with Edge and Chrome, the navigator.platform property now returns "Win32" even when running on 64-bit Windows (bug 1472618).
Prior to Firefox 63, links that open new windows that had rel="noopener", as well as calls to Window.open() with the noopener window feature enabled would default to having all window features disabled, so that you had to explicitly re-enable any standard features you wanted. Now these windows have the same set of features enabled as any other window, and you need to explicitly turn off any you don't want (bug 1419960).
DOM events:
Handling of the Alt key on the right side of the keyboard has been improved on Windows. If the user's current keyboard layout maps the Alt key to the AltGr modifier key, the value of KeyboardEvent.key is now reported as "AltGraph". This behavior matches that recently introduced into Chrome (bug 900760).
Service workers:
The createObjectURL() and revokeObjectURL() methods are no longer available on ServiceWorker instances due to the potential they introduced for memory leaks to occur (bug 1264182).
Media, Web Audio, and WebRTC:
Microphone access now works simultaneously in multiple tabs, even within the same content process. This improvement applies to the regular version of Firefox as well, though web developers were probably most likely to run into this (bug 1404977).
RTCDataChannel has been updated to support the sctp-sdp-21 data format for the data, in addition to the older sctp-sdp-05 format previously supported.
Since it was deprecated in the specification anyway, the limited support for Doppler effects on PannerNode has been removed from the Web Audio API. The AudioListener properties dopplerFactor and speedOfSound have been removed, along with the PannerNode method setVelocity() (bug 1148354).
The ConstantSourceNode node type for Web Audio API now has a default channel count of 2 rather than 1, in order to match the specification (bug 1413283).
The Web Audio API interface AudioScheduledSourceNode (and by extension, all the other node types based on it) now throw the correct exception when a negative value is specified for the node start time. That error is RangeError (bug 1413284).
The minimum and maximum permitted values for an AudioParam object's value have been changed to the minimum negative single-precision floating-point value (-340,282,346,638,528,859,811,704,183,484,516,925,440) and the maximum positive single-precision floating-point value (+340,282,346,638,528,859,811,704,183,484,516,925,440), respectively (bug 1476695).
The {domxref("SourceBuffer.changeType")}} method, which allows changing codecs during an active stream, has been enabled by default. This is part of the Media Source Extensions API (bug 1481166).
The AudioParam.setValueCurveAtTime() method has been updated to correctly accept an array of floating-point values to indicate the parameter's values to change to over time. Previously, it was requiring a Float32Array (bug 1421091).
AudioParam.setValueCurveAtTime() has also been updated to correctly return a proper TypeError when a non-finite value is found in the values array (bug 1472095).
In addition, setValueCurveAtTime() has been updated to ensure that when the parameter finishes following the specified value curve after the duration elapses, the value of the parameter is set to the last value in the list of values to curve through (bug 1308436).
The RTCRTPStreamStats dictionary has been renamed to RTCRtpStreamStats for consistency with the other dictionaries and the specification (bug 1480498).
The RTCRtpStreamStats dictionary's isRemote property is deprecated and will be removed in Firefox 65. A warning is now output to console when this property is accessed. See this blog post on the Advancing WebRTC blog for details (bug 1393306).
Canvas and WebGL:
A new powerPreference context attribute has been added to HTMLCanvasElement.getContext(). On macOS this allows WebGL non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems (bug 1349799).
Removals. CSSOM:
No changes
Removals. HTTP:
The Clear-Site-Data header is implemented and no longer behind a preference (bug 1470111).
Removals. Security:
Site favicons are now subject to Content Security Policy, if one is configured for the site (bug 1297156).
Firefox now recognizes the CSP script-src directive's 'report-sample' expression when generating violation reports. This directive indicates that a short sample of where the violation occurred should be included in the report. Previously, Firefox always included this sample (bug 1473218).
Removals. Plugins:
No changes
Removals. Other:
Corrected the behavior of PerformanceObserver.observe() to simply do nothing if no valid entry types are found in the specified array of entry types to observe, or if the array is empty or missing. Previously, Firefox was incorrectly throwing a TypeError (bug 1403027).
Changes for add-on developers:
API changes:
A "search" API was added to retrieve the installed search engines.
Added menus.getTargetElement() to the menus API. The method returns the element referenced by the targetElementId parameter (bug 1325814).

New in Firefox 62.0 (Sep 7, 2018)

Firefox Home (the default New Tab) now allows users to display up to 4 rows of top sites, Pocket stories, and highlights
“Reopen in Container” tab menu option appears for users with Containers that lets them choose to reopen a tab in a different container
In advance of removing all trust for Symantec-issued certificates in Firefox 63, a preference was added that allows users to distrust certificates issued by Symantec. To use this preference, go to about:config in the address bar and set the preference "security.pki.distrust_ca_policy" to 2.
Added FreeBSD support for WebAuthn
Improved graphics rendering for Windows users without accelerated hardware using Parallel-Off-Main-Thread Painting
Support for CSS Shapes, allowing for richer web page layouts. This goes hand in hand with a brand new Shape Path Editor in the CSS inspector.
CSS Variable Fonts (OpenType Font Variations) support, which makes it possible to create beautiful typography with a single font file
Updates for enterprise environments:
AutoConfig is sandboxed to the documented API by default. You
can disable the sandbox by setting the preference
general.config.sandbox_enabled to false. Our long term plan is to
remove the ability to turn off the sandboxing. If you need to
continue to use more complex AutoConfig scripts, you will need to use
Firefox Extended Support Release (ESR).
Added Canadian English (en-CA) locale
Security vulnerability fixes:
CVE-2018-12377: Use-after-free in refresh driver timers. A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash.
CVE-2018-12378: Use-after-free in IndexedDB. A use-after-free vulnerability can occur when an IndexedDB index is deleted while still in use by JavaScript code that is providing payload values to be stored. This results in a potentially exploitable crash.
CVE-2018-12379: Out-of-bounds write with malicious MAR file. When the Mozilla Updater opens a MAR format file which contains a very long item filename, an out-of-bounds write can be triggered, leading to a potentially exploitable crash. This requires running the Mozilla Updater manually on the local system with the malicious MAR file in order to occur.
CVE-2017-16541: Proxy bypass using automount and autofs. Browser proxy settings can be bypassed by using the automount feature with autofs to create a mount point on the local file system. Content can be loaded from this mounted file system directly using a file: URI, bypassing configured proxy settings. Note: this issue only affects OS X in default configurations. On Linux systems, autofs must be installed for the vulnerability to occur and Windows is not affected.
CVE-2018-12381: Dragging and dropping Outlook email message results in page navigation. Manually dragging and dropping an Outlook email message into the browser will trigger a page navigation when the message's mail columns are incorrectly interpreted as a URL. Note: this issue only affects Windows operating systems with Outlook installed. Other operating systems are not affected.
CVE-2018-12382: Addressbar spoofing with javascript URI on Firefox for Android. The displayed addressbar URL can be spoofed on Firefox for Android using a javascript: URI in concert with JavaScript to insert text before the loaded domain name, scrolling the loaded domain out of view to the right. This can lead to user confusion. Note: this vulnerability only affects Firefox for Android.
CVE-2018-12383: Setting a master password post-Firefox 58 does not delete unencrypted previously stored passwords. If a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Firefox 58. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations.
CVE-2018-12375: Memory safety bugs fixed in Firefox 62. Mozilla developers and community members Christian Holler, Looben Yang, Jesse Ruderman, Sebastian Hengst, Nicolas Grunbaum, and Gary Kwong reported memory safety bugs present in Firefox 61. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.
CVE-2018-12376: Memory safety bugs fixed in Firefox 62 and Firefox ESR 60.2. Mozilla developers and community members Alex Gaynor, Boris Zbarsky, Christoph Diehl, Christian Holler, Jason Kratzer, Jed Davis, Tyson Smith, Bogdan Tara, Karl Tomlinson, Mats Palmgren, Nika Layzell, Ted Campbell, and Andrei Cristian Petcu reported memory safety bugs present in Firefox 61 and Firefox ESR 60.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.
Changed:
Removed the description field for bookmarks. Users who have stored descriptions using the field may wish to export these descriptions as html or json files, as they will be removed in a future release.
Dark theme is automatically enabled in macOS 10.14 dark mode
Changed the default setting to Enforce (3) for the security.pki.name_matching_mode preference
Adobe Flash applets now run in a more secure mode using process sandboxing on macOS. Learn how this may affect features here.
Users disconnecting from Sync are now offered the option to wipe their Firefox profile data (including bookmarks, passwords, history, cookies, and site data) from their desktop computer
Changed how WebRTC handles screen sharing: When screen-sharing a window, the window will be brought to front
Developer:
Three-pane Inspector in Developer Tools separates the rules into its own panel
The Shape Path Editor is now available by default — see Edit Shape Paths in CSS for more information.
You can now split the Rules view out into its own pane, separate from the other tabs on the CSS pane. See Page inspector 3-pane mode for more details.
The Grid inspector has updated features, and all new documentation — see CSS Grid Inspector: Examine grid layouts.
You now have four options for the location of the Developer Tools. In addition to the default location on the bottom of the window, you can choose to locate the tools on either the left or right sides of the main window or in a separate window (bug 1192642).
The Accessibility inspector has had a couple of minor updates:
It no longer exposes the help property, which isn't properly implemented in Gecko (bug 1467643).
The keyboardShortcut property now correctly exposes any keyboard shortcut available to activate the currently inspected node (bug 1467381).
A close button has been added to the split console toolbar.
If the option to "Select an iframe as the currently targeted document" is checked, the icon will appear in the toolbar while the Settings tab is displayed, even if the current page doesn't include any iframes (bug 1456069).
The Network Monitor's Cookies tab now shows the cookie samesite attribute (bug 1452715).
Responsive design mode now works inside container tabs (bug 1306975).
When CORS errors occur and are reported on the console, Firefox now provides a link to the corresponding page in our CORS error documentation (bug 1475391).
Create a screenshot of the current page (with an optional filename) from the Console tab (bug 1464461) using the following command:
:screenshot <filename.png> --fullpage
where <filename.png> is the desired filename. The file will be saved to your downloads folder. The --fullpage parameter is optional, but if included, it will save the full web page. This option also adds -fullpage to the name of the file. For a list of all options available for this command, enter: :screenshot --help
Removals:
The Developer Toolbar/GCLI (accessed with Shift + F2), has been removed from Firefox (bug 1461970). Both the Developer Toolbar UI and the GCLI upstream library have become unmaintained, some of its features are broken (some ever since e10s), it is blocking the unsafeSetInnerHTML work, usage numbers are very low, alternatives exist for the most used commands.
HTML:
No changes
CSS:
:-moz-selection has been unprefixed to ::selection (bug 509958).
x is now supported as a unit for the <resolution> type (bug 1460655).
shape-margin, shape-outside, and shape-image-threshold are now enabled by default (bug 1457297).
Removals:
All XUL display values with the exception of -moz-box and -moz-inline-box have been removed from non-XUL documents in bug 1288572.
SVG:
No changes
JavaScript:
The WebAssembly.Global() constructor is now supported, along with global variables in WebAssembly (bug 1464656).
The Array.prototype.flat() and Array.prototype.flatMap() methods are now enabled by default (bug 1435813).
The import.meta property has been implemented to expose context-specific metadata to a JavaScript module (bug 1427610).
JavaScript string literals may now directly contain the U+2028 LINE SEPARATOR and U+2029 PARAGRAPH SEPARATOR characters. As a consequence, JSON syntax is now a subset of JavaScript literal syntax (see bug 1435828 and the TC39 proposal json-superset).
For out-of-bounds typed array indexes, Reflect.defineProperty() and Reflect.set() will now return false instead of true (bug 1308735).
Removals:
The DOMPoint and DOMPointReadOnly constructors no longer support an input parameter of type DOMPointInit; the values of the properties must be specified using the x, y, z, and w parameters (bug 1186265).
The URL.createObjectURL() method no longer supports creating object URLs to represent a MediaStream. This capability has been obsolete for some time now, since you can now simply set HTMLMediaElement.srcObject to the MediaStream directly (bug 1454889).
APIs:
New APIs:
The Speech Synthesis API (Text-to-Speech) is now enabled by default on Firefox for Android (bug 1463496).
DOM:
The DOMPointReadOnly interface now supports the static function DOMPointReadOnly.fromPoint(), which creates a new point object from a dictionary that's compatible with DOMPointInit, which includes any DOMPoint object. This function is also available on DOMPoint (bug 1186265).
For compatibility purposes, the Event.srcElement property is now supported. It is an alias for Event.target (bug 453968).
Navigator.registerProtocolHandler() now must only be called from a secure context (bug 1460506).
The Navigator.registerContentHandler() method has been disabled by default in preparation for being removed entirely, as it's been obsolete for some time (bug 1460481).
The DataTransfer() constructor has been implemented (bug 1351193).
Document.domain can no longer return null (bug 819475). If the domain cannot be identified, then domain returns an empty string instead of null.
Added the Console.timeLog() method to display the current value of a console timer while continuing to track the time (bug 1458466).
Added Console.countReset() to reset a console counter value (bug 1459279).
DOM events:
No changes
Service workers:
No changes
Media, Web Audio, and WebRTC:
The "media.autoplay.enabled" preference now controls automatic playback of both audio and video media, instead of just video media (bug 1413098).
The ChannelSplitterNode has been fixed to correctly default to having 6 channels with the channelInterpretation set to "discrete" and the channelCountMode set to "explicit", as per the specification (bug 1456265).
Removals:
The userproximity and deviceproximity events (see also UserProximityEvent and DeviceProximityEvent) have been disabled by default behind the device.sensors.proximity.enabled preference (bug 1462308).
The devicelight event (see also DeviceLightEvent) has been disabled by default behind the device.sensors.ambientLight.enabled preference (bug 1462308).
The DOMSubtreeModified and DOMAttrModified mutation events are no longer thrown when the style attribute is changed via the CSSOM (bug 1460295, see also this site compatibility post).
Support for CSSStyleDeclaration.getPropertyCSSValue() has been removed (bug 1408301).
Support for CSSValue, CSSPrimitiveValue, and CSSValueList has been removed (bug 1459871).
window.getComputedStyle() no longer returns null when called on a Window which has no presentation (bug 1467722).
HTTP:
Removals:
The deprecated CSP referrer directive has been removed. Please use the Referrer-Policy header instead (bug 1302449).
Security:
No changes
Plugins:
No changes
Other:
No changes

New in Firefox 62.0b Beta (Jul 17, 2018)

New in Firefox 61.0.1 (Jul 6, 2018)

New in Firefox 61.0 (Jun 28, 2018)

NEW:
Enhanced performance:
Faster page rendering with Quantum CSS improvements and the new retained display list feature
Faster switching between tabs on Windows and Linux
Convenient access to more search engines: You can now add search engines to the address bar “Search with” tool from the page action menu when on a webpage that provides an OpenSearch plugin
Share links from Firefox for MacOS more easily: You can now share the URL of an active tab from the page actions menu in the address bar
Improved security:
On-by-default support for the latest draft of the TLS 1.3 specification
Access to FTP subresources inside http(s) pages has been blocked
A more consistent user experience: Improvements for dark theme support across the entire Firefox user interface
More customization for tab management: added support to allow WebExtensions to hide tabs
Improved bookmark syncing
CHANGED:
The settings for customizing your homepage and new tab page in Firefox have been added to a new Preferences section that can be accessed from Firefox at about:preferences#home. The settings can also be accessed via the gear icon on the New Tab page.
SECURITY FIXES:
CVE-2018-12359: Buffer overflow using computed size of canvas element
CVE-2018-12360: Use-after-free when using focus()
CVE-2018-12361: Integer overflow in SwizzleData
CVE-2018-12358: Same-origin bypass using service worker and redirection
CVE-2018-12362: Integer overflow in SSSE3 scaler
CVE-2018-5156: Media recorder segmentation fault when track type is changed during capture
CVE-2018-12363: Use-after-free when appending DOM nodes
CVE-2018-12364: CSRF attacks through 307 redirects and NPAPI plugins
CVE-2018-12365: Compromised IPC child process can list local filenames
CVE-2018-12371: Integer overflow in Skia library during edge builder allocation
CVE-2018-12366: Invalid data handling during QCMS transformations
CVE-2018-12367: Timing attack mitigation of PerformanceNavigationTiming
CVE-2018-12368: No warning when opening executable SettingContent-ms files
CVE-2018-12369: WebExtension security permission checks bypassed by embedded experiments
CVE-2018-12370: SameSite cookie protections bypassed when exiting Reader View
CVE-2018-5186: Memory safety bugs fixed in Firefox 61
CVE-2018-5187: Memory safety bugs fixed in Firefox 60 and Firefox ESR 60.1
CVE-2018-5188: Memory safety bugs fixed in Firefox 60, Firefox ESR 60.1, and Firefox ESR 52.9

New in Firefox 60.0.2 (Jun 7, 2018)

New in Firefox 60.0.1 (May 17, 2018)

New in Firefox 61.0 Beta (May 15, 2018)

New in Firefox 60.0 (May 9, 2018)

New in Firefox 59.0.2 (Mar 27, 2018)

New in Firefox 59.0.1 (Mar 26, 2018)

New in Firefox 60.0 Beta (Mar 20, 2018)

New in Firefox 59.0 (Mar 14, 2018)

New in Firefox 58.0.2 (Feb 8, 2018)

New in Firefox 58.0 (Jan 29, 2018)

New in Firefox 57.0.4 (Jan 5, 2018)

New in Firefox 57.0.2 (Dec 8, 2017)

New in Firefox 58.0 Beta (Nov 14, 2017)

New in Firefox 57.0 Beta (Oct 31, 2017)

New in Firefox 56.0.2 (Oct 27, 2017)

New in Firefox 56.0.1 (Oct 10, 2017)

New in Firefox 56.0 (Oct 6, 2017)

New in Firefox 56.0b8 Beta (Sep 4, 2017)

New in Firefox 56.0b4 Beta (Aug 22, 2017)

Bug 1391297 - Update MAR to sha384 past 56.0b4 in update-packaging Makefile.
Bug 1390002 - There are some paths to find out if dwrite is enabled, which inits gfxPlatform, which requires information from PopulateScreenInfo, which depends on the refresh driver existing. At this time however, we haven't initialized our vsync source so we crash. This moves vsync initialization earlier in the gfx pipeline.
Bug 1388166 - Handle case where chromeWin.getBrowser() doesn't exist.
Bug 1350152 - Don't rely on gBrowser in nsLoginManagerPrompter. In bug 1266836 we fixed this code to properly work in e10s, but made the mistake of using gBrowser in toolkit code, breaking XUL apps that don't have a gBrowser. This solution implements a different code-path for non-e10s and returns a chrome window for consumers that don't offer a browser.
Bug 1385905 - part2: HTMLEditRules::SplitParagraph() should insert normal <br> element rather than moz-<br> element if split element and/or new element is empty. Currently, HTMLEditRules::SplitParagraph() inserts moz-<br> element when split element and/or new element causes empty line. However, PlaintextSerializer ignores moz-<br> elements. Therefore, empty lines which are created by SplitParagraph() will be removed when it's converted to plaintext. So, it should insert normal <br> element for placeholder of empty lines instead. Note that moz-<br> elements are appeared as normal <br> elements in the result of Element.innerHTML. Additionally, Chromium always inserts a <br> element for empty block elements which are created by Enter key press. Therefore, using normal <br> element in this case shouldn't cause any compatibility problems.
Bug 1387524 - Back out removal of MOZ_PRETTY to build Thunderbird 56 beta.
Backed out changesets 84f048b7dca0 and c261040950bf (bug 1389300) for Stylo svg-as-image reftest failures.
Backed out changeset 554f6e2674fe (bug 1388319)
Bug 1388319 - Mark ServoStyleSet dirty in its Init
Bug 1376754 - Remove hide event target flag from accessible when event is dropped.
Bug 1389300 - Don't mix style backend types in nsComputedDOMStyle.
Bug 1389300 - Inherit style backend into NS_NewDOMDocument.
Bug 1390002 - There are some paths to find out if dwrite is enabled, which inits gfxPlatform, which requires information from PopulateScreenInfo, which depends on the refresh driver existing. At this time however, we haven't initialized our vsync source so we crash. This moves vsync initialization earlier in the gfx pipeline.
Bug 1390038 - Fix xml parsing error
Bug 1363723 - Preserve array in aria owns hash.
Bug 1384944 - Replace NS_ConvertASCIItoUTF16 by NS_ConvertUTF8toUTF16.

New in Firefox 55.0.2 (Aug 16, 2017)

New in Firefox 55.0.1 (Aug 10, 2017)

New in Firefox 55.0 (Aug 9, 2017)

oday's release brings innovative functionality, improvements to core browser performance, and more proof that we’re committed to making Firefox better than ever. New features include support for WebVR, making Firefox the first Windows desktop browser to support VR experiences. Performance changes include significantly faster startup times when restoring lots of tabs and settings that let users take greater control of our new multi-process architecture. We’ve also upgraded the address bar to make finding what you want easier, with search suggestions and the integration of our one-click search feature, and safer, by prioritizing the secure - https - version of sites when possible. Read what Nick Nguyen (VP, Firefox Product) has to say about Firefox 55, get historical perspective on the development of WebVR from Sean White (SVP, Emerging Technologies) in this Medium post, and read about all the new features for developers in Firefox 55 on Mozilla Hacks.
We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!
NEW:
Launched Windows support for WebVR, bringing immersive experiences to the web. See examples and try working demos at Mozilla VR.
Added options that let users optimize recent performance improvements:
Setting to enable Hardware VP9 acceleration on Windows 10 Anniversary Edition for better battery life and lower CPU usage while watching videos
Setting to modify the number of concurrent content processes for faster page loading and more responsive tab switching
Simplified installation process with a streamlined Windows stub installer:
Firefox for Windows 64-bit is now installed by default on 64-bit systems with at least 2GB of RAM
Full installers with advanced installation options are still available
Improved address bar functionality:
Search with any installed one-click search engine directly from the address bar
Search suggestions appear by default
When entering a hostname (like pinterest.com) in the URL bar, Firefox resolves to the secure version of the site (https://www.pinterest.com) instead of the insecure version (http://www.pinterest.com) when possible
Updated Sidebar for bookmarks, history, and synced tabs so it can appear at the right edge of the window as well as the left
Added support for stereo microphones with WebRTC
Pages can be simplified before printing from within Print Preview
Updated Firefox for OSX and macOS to allow users to assign custom keyboard shortcuts to Firefox menu items via System Preferences
Browsing sessions with a high number of tabs are now restored in an instant
Make screenshots of webpages, and save them locally or upload them to the cloud. This feature will undergo A/B testing and will not be visible for some users.
Added Belarusian (be) locale
FIXES:
Various security fixes
CHANGED:
Made the Adobe Flash plugin click-to-activate by default and allowed only on http:// and https:// URL schemes. (This change will not be visible to all users immediately. For more information see the Firefox plugin roadmap)
Firefox does not support downgrades, even though this may have worked in past versions. Users who install Firefox 55+ and later downgrade to an earlier version may experience issues with Firefox.
Modernized application update UI to be less intrusive and more aligned with the rest of the browser. Only users who have not restarted their browser 8 days after downloading an update or users who opted out of automatic updates will see this change.
DEVELOPER:
Sites that don’t use SSL can no longer access Geolocation APIs to determine a user’s physical location

New in Firefox 56.0b1 Beta (Aug 8, 2017)

New in Firefox 55.0b10 Beta (Jul 21, 2017)

New in Firefox 54.0.1 (Jun 30, 2017)

New in Firefox 55.0b4 Beta (Jun 27, 2017)

New in Firefox 55.0b2 Beta (Jun 17, 2017)

New in Firefox 55.0b1 Beta (Jun 16, 2017)

New in Firefox 54.0 (Jun 13, 2017)

New in Firefox 53.0.2 (May 6, 2017)

New in Firefox 54.0b1 Beta (Apr 21, 2017)

New in Firefox 53.0 (Apr 19, 2017)

New in Firefox 53.0b4 Beta (Mar 18, 2017)

New in Firefox 52.0.1 (Mar 17, 2017)

NEW:
Added support for WebAssembly, an emerging standard that brings near-native performance to Web-based games, apps, and software libraries without the use of plugins
Added automatic captive portal detection, for easier access to Wi-Fi hotspots. When accessing the Internet via a captive portal, Firefox will alert users and open the portal login page in a new tab
Implemented the Strict Secure Cookies specification which forbids insecure HTTP sites from setting cookies with the "secure" attribute. In some cases, this will prevent an insecure site from setting a cookie with the same name as an existing "secure" cookie from the same base domain
Added user warnings for non-secure HTTP pages with logins. Firefox now displays a “This connection is not secure” message when users click into the username and password fields on pages that don’t use HTTPS
Enhanced Sync to allow users to send and open tabs from one device to another
FIXED:
Various security fixes
Improved text input for third-party keyboard layouts on Windows. This will address some keyboard layouts that:
have chained dead keys
input two or more characters with a non-printable key or a dead key sequence
input a character even when a dead key sequence failed to compose a character
CHANGED:
Removed support for Netscape Plugin API (NPAPI) plugins other than Flash. Silverlight, Java, Acrobat and the like are no longer supported.
Removed Battery Status API to reduce fingerprinting of users by trackers
When not using Direct2D on Windows, Skia is used for content rendering
Migrated Firefox users on Windows XP and Windows Vista operating systems to the extended support release (ESR) version of Firefox
Display (but allow users to override) an “Untrusted Connection” error when encountering SHA-1 certificates that chain up to a root certificate included in Mozilla’s CA Certificate Program. (Note: Firefox continues to permit SHA-1 certificates that chain to manually imported root certificates.) Read more about the Mozilla Security Team’s plans to deprecate SHA-1
Improved experience for downloads:
Notification in the toolbar when a download fails
Quick access to five most recent downloads rather than three
Larger buttons for canceling and restarting downloads
DEVELOPER:
Enabled CSS Grid Layout, opening up a world of new possibilities for graphic design
Improved security for screen sharing, which now shows a preview and no longer requires a whitelisted domain
Redesigned Responsive Design Mode to include device selection, network throttling, and more

New in Firefox 53.0b1 Beta (Mar 8, 2017)

New in Firefox 51.0 (Jan 23, 2017)

New in Firefox 50.1.0 (Dec 15, 2016)

Security vulnerabilities fixed in Firefox 50.1:
CVE-2016-9894: Buffer overflow in SkiaGL. A buffer overflow in SkiaGl caused when a GrGLBuffer is truncated during allocation. Later writers will overflow the buffer, resulting in a potentially exploitable crash.
CVE-2016-9899: Use-after-free while manipulating DOM events and audio elements. Use-after-free while manipulating DOM events and removing audio elements due to errors in the handling of node adoption.
CVE-2016-9895: CSP bypass using marquee tag. Event handlers on marquee elements were executed despite a strict Content Security Policy (CSP) that disallowed inline JavaScript.
CVE-2016-9896: Use-after-free with WebVR. Use-after-free while manipulating the navigator object within WebVR. Note: WebVR is not currently enabled by default.
CVE-2016-9897: Memory corruption in libGLES. Memory corruption resulting in a potentially exploitable crash during WebGL functions using a vector constructor with a varying array within libGLES.
CVE-2016-9898: Use-after-free in Editor while manipulating DOM subtrees. Use-after-free resulting in potentially exploitable crash when manipulating DOM subtrees in the Editor.
CVE-2016-9900: Restricted external resources can be loaded by SVG images through data URLs. External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of data: URLs. This could allow for cross-domain data leakage.
CVE-2016-9904: Cross-origin information leak in shared atoms. An attacker could use a JavaScript Map/Set timing attack to determine whether an atom is used by another compartment/zone in specific contexts. This could be used to leak information, such as usernames embedded in JavaScript code, across websites.
CVE-2016-9901: Data from Pocket server improperly sanitized before execution. HTML tags received from the Pocket server will be processed without sanitization and any JavaScript code executed will be run in the about:pocket-saved (unprivileged) page, giving it access to Pocket's messaging API through HTML injection.
CVE-2016-9902: Pocket extension does not validate the origin of events. The Pocket toolbar button, once activated, listens for events fired from it's own pages but does not verify the origin of incoming events. This allows content from other origins to fire events and inject content and commands into the Pocket context.
CVE-2016-9903: XSS injection vulnerability in add-ons SDK. Mozilla's add-ons SDK had a world-accessible resource with an HTML injection vulnerability. If an additional vulnerability allowed this resource to be loaded as a document it could allow injecting content and script into an add-on's context.
CVE-2016-9080: Memory safety bugs fixed in Firefox 50.1. Mozilla developers and community members Kan-Ru Chen, Christian Holler, and Tyson Smith reported memory safety bugs present in Firefox 50.0.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.
CVE-2016-9893: Memory safety bugs fixed in Firefox 50.1 and Firefox ESR 45.6. Mozilla developers and community members Jan de Mooij, Iris Hsiao, Christian Holler, Carsten Book, Timothy Nikkel, Christoph Diehl, Olli Pettay, Raymond Forbes, and Boris Zbarsky reported memory safety bugs present in Firefox 50.0.2 and Firefox ESR 45.5.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.

New in Firefox 51.0b5 Beta (Dec 2, 2016)

New in Firefox 50.0.1 (Nov 28, 2016)

New in Firefox 50.0 (Nov 16, 2016)

New in Firefox 50.0b10 Beta (Oct 25, 2016)

New in Firefox 50.0b9 Beta (Oct 21, 2016)

New in Firefox 49.0.2 (Oct 20, 2016)

New in Firefox 50.0b7 Beta (Oct 14, 2016)

New in Firefox 50.0b4 Beta (Oct 7, 2016)

New in Firefox 50.0b2 Beta (Sep 27, 2016)

New in Firefox 50.0b1 Beta (Sep 21, 2016)

New in Firefox 49.0 (Sep 21, 2016)

New in Firefox 49.0b9 Beta (Sep 2, 2016)

Backed out changeset afd10ab995e0 (bug 1244425) for mn bustage
Bug 1299445 - use distribution.ini directly to check if automigration is enabled
Bug 1298771 - Attach last-update.log to update results for Firefox UI update tests
Bug 1294054 - Use marionette.py instead of runner.py in case of crashes with no active test.
Bug 1284457 - Reduce default socket timeout for Marionette to 60s
Bug 1244425 - Avoid CPOW when setting file array on
Bug 1280947 - Dispatch DOM change event on appending file to input
Bug 1280947 - Correct argument to event.sendEvent
Bug 1280947 - Remove dead File object construction code
Bug 1280947 - Support tuples for script arguments. Tuples is are most commonly used in the Python standard library to represent function argument iterables. This patch changes the Marionette Python client to support both tuples and lists.
Bug 1280947 - Improve names of JSON marshaling methods in Marionette client
Bug 1297446 - Shimwaiver for l10n
Bug 1051567 - Make sure we resend file descriptors for the first chunk of a message. Check if the buffers iterator was never consumed. This is a regression
introduced when converting ipc to use BufferList in bug 1262671.
Bug 1298505 - CSP: Update StripURIForReporting to rely on NS_SecurityCompareURIs
Bug 1294536 KeyboardLayout::InitNativeKey() shouldn't initialize NativeKey with WM_CHAR whose wParam isn't a printable character. KeyboardEvent::InitNativeKey() should initialize NativeKey if it's created for handling an orphan WM_CHAR message, however, if it the charCode isn't a printable character such as 0x0D for Enter key, it shouldn't refer it because focused editor shouldn't handle keyboard event as inputting the non-printable character.
Bug 1299256 - Fix performance issues when stripping comments from large locale files.
Bug 1293308 - System font setting respected by location bar but ignored by location bar's autocomplete drop-down list.
Bug 1282746
Bug 1265249 - Fix painting of drag selections that contain multiple ranges

New in Firefox 49.0b8 Beta (Aug 30, 2016)

New in Firefox 49.0b7 Beta (Aug 30, 2016)

New in Firefox 49.0b6 Beta (Aug 26, 2016)

New in Firefox 49.0b5 Beta (Aug 26, 2016)

New in Firefox 48.0.1 (Aug 18, 2016)

New in Firefox 49.0b4 Beta (Aug 16, 2016)

New in Firefox 49.0b3 Beta (Aug 16, 2016)

New in Firefox 49.0b2 Beta (Aug 12, 2016)

New in Firefox 49.0b1 Beta (Aug 3, 2016)

New in Firefox 48.0 (Aug 2, 2016)

NEW:
Roar for moar protection against harmful downloads! We've got your back
Process separation (e10s) is enabled for some of you. Like it? Let us know and we'll roll it out to more.
Add-ons that have not been verified and signed by Mozilla will not load
GNU/Linux fans: Get better Canvas performance with speedy Skia support. Try saying that three times fast
WebRTC embetterments:
Delay-agnostic AEC enabled
Full duplex for GNU/Linux enabled
ICE Restart & Update is supported
Cloning of MediaStream and MediaStreamTrack is now supported
Searching for something already in your bookmarks or open tabs? We added super smart icons to let you know
Windows folks: Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode
The media parser has been redeveloped using the Rust programming language
FIXED:
Various security fixes
Heyo, Jabra & Logitech C920 webcam users. We fixed those pesky WebRTC bugs causing frequency distortions. Buh-bye, squeaky voice!
Improved step debugging on last line of functions
CHANGED:
After version 48, SSE2 CPU extensions are going to be required on Windows
So long to support for 10.6, 10.7 and 10.8. Now we can focus on where most Mac users are: 10.9. Don't forget to upgrade
Au revoir to Windows Remote Access Service modem Autodial
DEVELOPER:
WebExtensions support is now considered as stable
Want to move absolute & fixed positioned elements? (Who doesn't, right?) Now you can with our geometry editor.
The memory tool now has a tree map view for your debugging pleasure. It's a little bit of "boo" and a whole lot of "ya."
We're putting the spotlight on the background. Now you can debug WebExtensions background content scripts and background pages
Content Security Policy (CSP) is now enforced for WebExtensions. (Who's down with CSP?)
Old and busted: Error Console. New hotness: Browser Console for your debugging pleasure.
Add-on development just got easier because you can reload them from about:debugging — because we're all about debugging.
This theme is hot, hot, hot! Say hi to the Firebug theme for Developer Tools.
Expand network requests from the console panel to view request details in line, so you can see things in context
Workers can now use the Web Crypto API

New in Firefox 48.0b10 Beta (Jul 25, 2016)

New in Firefox 48.0b9 Beta (Jul 19, 2016)

New in Firefox 48.0b6 Beta (Jul 8, 2016)

New in Firefox 48.0b5 Beta (Jul 7, 2016)

New in Firefox 47.0.1 (Jun 29, 2016)

New in Firefox 47.0 (Jun 28, 2016)

New in Firefox 48.0b4 Beta (Jun 28, 2016)

New in Firefox 48.0b3 Beta (Jun 24, 2016)

New in Firefox 48.0b2 Beta (Jun 23, 2016)

New in Firefox 48.0b1 Beta (Jun 8, 2016)

New in Firefox 47.0 RC 2 (Jun 3, 2016)

New in Firefox 47.0b8 Beta (May 24, 2016)

New in Firefox 47.0b6 Beta (May 17, 2016)

New in Firefox 47.0b5 Beta (May 13, 2016)

Bug 1216658 - Ignore Gt3 dark themes and use light theme's color scheme for native widgets
Bug 1271032 - Make getPref Unicode-aware
Bug 1271280 - Places shutdown blockers have wrong names and are not properly reporting state
Bug 1247137 - Show spinner if switching away from browser that goes away immediately.
Bug 1269365 - Part 3 - Use infallible array allocation in implementSpecialArrayPickling. As with part 2, this will turn some allocation failures during
deserialization from IPC FatalError crashes into OOM crashes.
Bug 1269365 - Part 2 - Make ParamTraits::Read use infallible allocation. This will turn allocation failures during deserialization from IPC
FatalError crashes into OOM crashes.
Bug 1269365 - Part 1 - Swap fallible and infallible TArray ParamTraits. This should not change the behavior, because fallible_t is passed to
the array methods. Rename from InfallibleTArray to nsTArray, because that is more usual. Remove unnecessary spaces from some template definitions.
Bug 1271037 - Fix numOperands of RRegExpMatcher, and RRegExpTester.
Backed out 6 changesets (bug 1268749, bug 1268750) until a fix can be landed for the rc2 permafail a=backout
Bug 1255336: Copy DEVMODE details back to print settings in GetDataFromPrinter
Bug 1243538: P6. Adjust gonk decoder to allow different decoding size from metadata. Additionally handle bug 1154162, and fix aspect ratio. The display size were used for the picture size which would be wrong if any aspect ratio was set.
Bug 1243538: P5. Adjust wmf decoder to allow different decoding size from metadata.
Bug 1243538: P4. Adjust ffvpx decoder to allow different decoding size from metadata.
Bug 1243538: P3. Adjust libvpx decoder to allow different decoding size from metadata
Bug 1243538: P2. Add convenience VideoInfo::ScaledImageRect.
Bug 1243538: P1. Make MediaInfo::mImage an nsIntSize again and introduce a mImageRect member.
Bug 1268749 part 6 - Add test for behavior when unprefixed api is disabled.
Bug 1268749 part 5 - Avoid dispatching unprefixed fullscreen events to content if unprefixed API is disabled.
Bug 1268750 part 4 - Hide unprefixed Fullscreen API from content when disabled.

New in Firefox 47.0b4 Beta (May 13, 2016)

New in Firefox 47.0b3 Beta (May 13, 2016)

New in Firefox 46.0.1 (May 4, 2016)

New in Firefox 47.0b2 Beta (May 3, 2016)

New in Firefox 46.0 (Apr 25, 2016)

New in Firefox 46.0b10 Beta (Apr 12, 2016)

New in Firefox 45.0.2 (Apr 11, 2016)

New in Firefox 45.0.1 (Apr 11, 2016)

New in Firefox 46.0 Beta 8 (Apr 5, 2016)

New in Firefox 46.0 Beta 7 (Apr 2, 2016)

New in Firefox 46.0 Beta 4 (Mar 22, 2016)

New in Firefox 45.0 (Mar 17, 2016)

New in Firefox 46.0 Beta 2 (Mar 17, 2016)

New in Firefox 46.0 Beta 1 (Mar 10, 2016)

New in Firefox 45.0 (Mar 8, 2016)

New in Firefox 45.0 RC 1 (Mar 1, 2016)

New in Firefox 45.0b10 Beta (Feb 26, 2016)

New in Firefox 45.0b9 Beta (Feb 24, 2016)

New in Firefox 45.0b8 Beta (Feb 22, 2016)

New in Firefox 45.0b7 Beta (Feb 19, 2016)

New in Firefox 45.0b6 Beta (Feb 16, 2016)

New in Firefox 45.0b5 Beta (Feb 12, 2016)

New in Firefox 44.0.2 (Feb 11, 2016)

New in Firefox 45.0b4 Beta (Feb 9, 2016)

New in Firefox 44.0.1 (Feb 8, 2016)

New in Firefox 45.0b3 Beta (Feb 5, 2016)

New in Firefox 45.0b2 Beta (Feb 2, 2016)

New in Firefox 46.0a2 Developer (Jan 29, 2016)

New in Firefox 45.0b1 Beta (Jan 29, 2016)

New in Firefox 44.0 (Jan 27, 2016)

New:
Improved warning pages for certificate errors and untrusted connections
Enable H.264 if system decoder is available
Enable WebM/VP9 video support on systems that don't support MP4/H.264
In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread
Support the brotli compression format via HTTPS content-encoding
Screenshot commands allow user choice of pixel ratio in Developer Tools
Fixed:
Windows XP and Vista screensaver doesn't disable when watching videos (Bug 1193610)
Various security fixes
Changed:
To support unicode-range descriptor for webfonts, font matching under Linux now uses the same font matching code as other platforms
Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements
Firefox has removed support for the RC4 decipher
Firefox will no longer trust the Equifax Secure Certificate Authority 1024-bit root certificate or the UTN - DATACorp SGC to validate secure website certificates
Stricter validation of web fonts
On-screen keyboard support temporarily turned off for Windows 8 and Windows 8.1
Developer:
Right click on a logged object in the console to store it as a global variable on the page
New memory tool for inspecting the memory heap
Service Workers API
Built-in JSON reader to intuitively view, search, copy and save data without extensions
Jump to function definitions in the debugger with Cmd-Click
WebSocket Debugging API and add-on
The rule view now displays styles using their authored text, and edits in the rule view are now linked to the style editor
Visual tools for Animation:
View/Edit CSS animation keyframe rules directly in the inspector
Visually modify the cubic-bezier curve that drives the way animations progress through time
Discover and scrub through all CSS animations and transitions playing on the page
Visual tools for Layout and Styles:
Display rulers along the viewport to verify size and position and use the measurement tool to easily detect spacing and alignment problems
Use CSS filters to preview and create real-time effects like drop-shadows, sepia, etc

New in Firefox 44.0b9 Beta (Jan 15, 2016)

New in Firefox 44.0b8 Beta (Jan 12, 2016)

New in Firefox 44.0b7 Beta (Jan 8, 2016)

New in Firefox 43.0.4 (Jan 6, 2016)

New in Firefox 44.0b6 Beta (Jan 5, 2016)

New in Firefox 44.0b4 Beta (Dec 29, 2015)

New in Firefox 43.0.3 (Dec 28, 2015)

New in Firefox 43.0.2 (Dec 23, 2015)

New in Firefox 43.0.2 RC 1 (Dec 22, 2015)

New in Firefox 44.0b2 Beta (Dec 22, 2015)

New in Firefox 43.0.1 (Dec 21, 2015)

New in Firefox 43.0 (Dec 14, 2015)

New in Firefox 43.0 RC 1 (Dec 8, 2015)

New in Firefox 43.0b9 Beta (Dec 4, 2015)

New in Firefox 43.0b8 Beta (Dec 2, 2015)

New in Firefox 43.0b7 Beta (Nov 27, 2015)

New in Firefox 43.0b6 Beta (Nov 24, 2015)

New in Firefox 43.0b5 Beta (Nov 20, 2015)

New in Firefox 43.0b3 Beta (Nov 13, 2015)

New in Firefox 43.0b2 Beta (Nov 10, 2015)

Backed out 4 changesets (bug 1210852 (https://bugzilla.mozilla.org/show_bug.cgi?id=1210852), bug 1103188 (https://bugzilla.mozilla.org/show_bug.cgi?id=1103188), bug 1070216 (https://bugzilla.mozilla.org/show_bug.cgi?id=1070216)) for various crashes with mediamanager.cpp assertions a=backout
Backed out changeset 3705005d2190 (bug 1070216 (https://bugzilla.mozilla.org/show_bug.cgi?id=1070216))
Backed out changeset c458ad434a12 (bug 1210852 (https://bugzilla.mozilla.org/show_bug.cgi?id=1210852))
Backed out changeset 1babaebeccc6 (bug 1103188 (https://bugzilla.mozilla.org/show_bug.cgi?id=1103188))
Backed out changeset b199ea9f265c (bug 1103188 (https://bugzilla.mozilla.org/show_bug.cgi?id=1103188))
Bug 1070216 (https://bugzilla.mozilla.org/show_bug.cgi?id=1070216) - Properly manage lifetime of allocated CaptureDevices. r=jib a=lizzard
We currently avoid Deallocating a CaptureDevice used for multiple gUMStreams when one of them calls Deallocate() by keeping track of how many called Start().
The normal lifetime sequence however, is:
Allocate()
Start()
Stop()
Deallocate()
This patches fixes the lifetime management by keeping track of how many users of the CaptureDevice called Allocate().
Bug 1210852 (https://bugzilla.mozilla.org/show_bug.cgi?id=1210852) - do SelectSettings of device capabilities on media thread. a=lizzard
Bug 1103188 (https://bugzilla.mozilla.org/show_bug.cgi?id=1103188) - Keep track of stopped tracks in gUM stream listener. r=jib a=lizzard
This is needed to avoid something like:
[old stream] stop track 1 -> deallocate MediaDevice for track 1
[new stream] gUM() -> allocate MediaDevice for track 1
[old stream] stop stream -> deallocate MediaDevice for track 1
[new stream] gUM() -> start MediaDevice for track 1 (oops, MediaDevice was no more!)
Bug 1103188 (https://bugzilla.mozilla.org/show_bug.cgi?id=1103188) - Keep track of capture stop only in gUM stream listener. r=jib a=lizzard
Bug 1199131 (https://bugzilla.mozilla.org/show_bug.cgi?id=1199131) - Crash when click on a SELECT wich has at least 1 OPTION with background-attachment:fixed and a background. r=mstange, a=lizzard
Bug 1156238 (https://bugzilla.mozilla.org/show_bug.cgi?id=1156238). At minimum always use the root reference frame as the "stop at" ancestor when finding the animated geometry root.
Bug 1156238 (https://bugzilla.mozilla.org/show_bug.cgi?id=1156238). Skip setting async scroll clips if we aren't painting to the window because they are useless then. r=mstange
Displayports only get acted upon when painting to the window, and the async scroll clips only get computed when we use a displayport.
In addition we change an assert because if we are painting to the window then our root reference frame is either a root frame, or a popup frame. In either case we should not be able to get to out of flows outside of the frame subtree rooted at the root reference frame by following placeholders.
Bug 1219134 (https://bugzilla.mozilla.org/show_bug.cgi?id=1219134): P4. Properly assign the decoded sample duration. r=edwin a=sylvestre
We default to the previous logic if for some unlikely condition we couldn't find the frame's duration (using the last input frame's duration)
Bug 1219134 (https://bugzilla.mozilla.org/show_bug.cgi?id=1219134): P3. Properly set the keyframe flag. r=edwin a=sylvestre
We were incorrectly setting the keyframe flag of the last input sample rather than of the decoded one.
Bug 1219134 (https://bugzilla.mozilla.org/show_bug.cgi?id=1219134): P1. Fix pts calculation in FFmpeg video decoder. r=edwin a=sylvestre
This is the primary reason why we got no pts returned (pts were set to 0) when using early version of LibAV. Apparently you are expected to set the pts when allocating the buffer of a frame.
This is undocumented, but both LibAV and FFmpeg do so internally. So do the same.
Bug 1220037 (https://bugzilla.mozilla.org/show_bug.cgi?id=1220037) - test convolution. r=padenot, a=sylvestre
This is in the mochitest suite so that Android and B2G tests can run it, but designed so that it can be moved to web-platform-tests when they run on all platforms.
Bug 1220037 (https://bugzilla.mozilla.org/show_bug.cgi?id=1220037) - pack and unpack Nyquist for MOZ_LIBAV_FFT. r=padenot, a=sylvestre
BufferComplexMultiply knows nothing about this format and so ends up corrupting the DC coefficient if packed Nyquists are multiplied.
Bug 1211708 (https://bugzilla.mozilla.org/show_bug.cgi?id=1211708) - Allow themes to specify XBL bindings even in unprivileged documents. r=sicking, a=sylvestre
Bug 1219833 (https://bugzilla.mozilla.org/show_bug.cgi?id=1219833) - Respect composition underline color; r=masayuki, a=sylvestre
nsTextFrame didn't use the composition underline color if the composition didn't have a foreground color defined. This patch makes it use the underline color if foreground color is not defined.
Bug 1219833 (https://bugzilla.mozilla.org/show_bug.cgi?id=1219833) - Respect composition underline color; r=masayuki, a=sylvestre
nsTextFrame didn't use the composition underline color if the composition didn't have a foreground color defined. This patch makes it use the underline color if foreground color is not defined.

New in Firefox 43.0b1 Beta (Nov 4, 2015)

New in Firefox 42.0 (Nov 2, 2015)

New in Firefox 42.0b9 Beta (Oct 23, 2015)

New in Firefox 42.0b8 Beta (Oct 20, 2015)

New in Firefox 42.0b7 Beta (Oct 16, 2015)

New in Firefox 41.0.2 (Oct 16, 2015)

New in Firefox 42.0b6 Beta (Oct 13, 2015)

New in Firefox 42.0b5 Beta (Oct 9, 2015)

New in Firefox 41.0.1 (Oct 1, 2015)

New in Firefox 41.0 (Sep 23, 2015)

New in Firefox 42.0b1 Beta (Sep 22, 2015)

New in Firefox 41.0b9 Beta (Sep 11, 2015)

New in Firefox 41.0b8 Beta (Sep 8, 2015)

New in Firefox 41.0b7 Beta (Sep 4, 2015)

New in Firefox 41.0b6 Beta (Sep 1, 2015)

New in Firefox 41.0b5 Beta (Aug 28, 2015)

New in Firefox 40.0.3 (Aug 28, 2015)

New in Firefox 40.0.3 RC 1 (Aug 27, 2015)

New in Firefox 41.0b4 Beta (Aug 26, 2015)

New in Firefox 41.0b2 Beta (Aug 18, 2015)

New in Firefox 40.0.2 (Aug 14, 2015)

New in Firefox 40.0.1 (Aug 13, 2015)

New in Firefox 40.0.2 RC 1 (Aug 13, 2015)

New in Firefox 41.0b1 Beta (Aug 12, 2015)

New in Firefox 40.0.1 RC 2 (Aug 12, 2015)

New in Firefox 40.0 (Aug 11, 2015)

New: Support for Windows 10
New: Added protection against unwanted software downloads
New: Suggested Tiles show sites of interest, based on categories from your recent browsing history
New: Hello allows adding a link to conversations to provide context on what the conversation will be about
New: New style for add-on manager based on the in-content preferences style
New: Improved scrolling, graphics, and video playback performance with off main thread compositing (GNU/Linux only)
New: Graphic blocklist mechanism improved: Firefox version ranges can be specified, limiting the number of devices blocked
Changed: Add-on extensions that are not signed by Mozilla will display a warning
Changed: Smoother animation and scrolling with hardware vsync (Windows only)
Changed: JPEG images use less memory when scaled and can be painted faster
Changed: Sub-resources can no longer request HTTP authentication, thus protecting users from inadvertently disclosing login data
Changed: NPAPI Plug-in performance improved via asynchronous initialization
HTML5: IndexedDB transactions are now non-durable by default
HTML5: Implemented AudioBufferSourceNode.detune to modulate playback rate in cents, a logarithmic unit of measure used for musical intervals
Developer: Improved Performance tools in the developer tools: Waterfall view, Call Tree view and a Flame Chart view
Developer: Console API messages from SharedWorker and ServiceWorker are now displayed in web console
Developer: Inspector now searches across all content frames in a page
Developer: New rules view tooltip in the Inspector to tweak CSS Filter values
Developer: New page ruler highlighting tool that displays lightweight horizontal and vertical rules on a page
Fixed: Kannada text does not display properly in built-in pdf viewer
Security fixes:
2015-92 Use-after-free in XMLHttpRequest with shared workers
2015-91 Mozilla Content Security Policy allows for asterisk wildcards in violation of CSP specification
2015-90 Vulnerabilities found through code inspection
2015-89 Buffer overflows on Libvpx when decoding WebM video
2015-88 Heap overflow in gdk-pixbuf when scaling bitmap images
2015-87 Crash when using shared memory in JavaScript
2015-86 Feed protocol with POST bypasses mixed content protections
2015-85 Out-of-bounds write with Updater and malicious MAR file
2015-84 Arbitrary file overwriting through Mozilla Maintenance Service with hard links
2015-83 Overflow issues in libstagefright
2015-82 Redefinition of non-configurable JavaScript object properties
2015-81 Use-after-free in MediaStream playback
2015-80 Out-of-bounds read with malformed MP3 file
2015-79 Miscellaneous memory safety hazards (rv:40.0 / rv:38.2)

New in Firefox 40.0 RC 5 (Aug 8, 2015)

New in Firefox 39.0.3 (Aug 7, 2015)

New in Firefox 40.0 RC 1 (Aug 4, 2015)

New in Firefox 40.0b9 Beta (Jul 31, 2015)

New in Firefox 40.0b8 Beta (Jul 28, 2015)

New in Firefox 40.0b7 Beta (Jul 24, 2015)

New in Firefox 40.0b6 Beta (Jul 22, 2015)

New in Firefox 40.0b4 Beta (Jul 14, 2015)

New in Firefox 40.0b3 Beta (Jul 10, 2015)

New in Firefox 40.0b2 Beta (Jul 7, 2015)

New in Firefox 39.0 (Jul 3, 2015)

New in Firefox 39.0 RC 6 (Jul 1, 2015)

New in Firefox 41.0a2 Developer (Jun 30, 2015)

New in Firefox 39.0 RC 5 (Jun 27, 2015)

New in Firefox 39.0 RC 4 (Jun 25, 2015)

New in Firefox 39.0 RC 3 (Jun 23, 2015)

New in Firefox 39.0b7 Beta (Jun 19, 2015)

New in Firefox 39.0b6 Beta (Jun 16, 2015)

New in Firefox 39.0b5 Beta (Jun 12, 2015)

New in Firefox 39.0b4 Beta (Jun 10, 2015)

New in Firefox 38.0.6 RC1 (Jun 6, 2015)

New in Firefox 39.0b3 Beta (Jun 5, 2015)

New in Firefox 39.0b2 Beta (Jun 2, 2015)

New in Firefox 39.0b1 Beta (May 25, 2015)

New in Firefox 38.0.5 RC 3 (May 22, 2015)

New in Firefox 38.0.5b3 Beta (May 19, 2015)

New in Firefox 38.0.5b2 Beta (May 15, 2015)

New in Firefox 38.0.1 (May 15, 2015)

New in Firefox 38.0.1 RC 1 (May 14, 2015)

New in Firefox 38.0 (May 12, 2015)

New in Firefox 38.0.5b1 Beta (May 11, 2015)

New in Firefox 38.0 RC 3 (May 9, 2015)

New in Firefox 38.0 RC 2 (May 4, 2015)

New in Firefox 38.0b9 Beta (Apr 30, 2015)

New in Firefox 38.0b7 Beta (Apr 25, 2015)

New in Firefox 38.0b6 Beta (Apr 21, 2015)

New in Firefox 37.0.2 (Apr 20, 2015)

New in Firefox 38.0b5 Beta (Apr 17, 2015)

New in Firefox 37.0.2 RC 1 (Apr 16, 2015)

New in Firefox 38.0b4 Beta (Apr 14, 2015)

New in Firefox 38.0b3 Beta (Apr 10, 2015)

New in Firefox 38.0b2 Beta (Apr 7, 2015)

New in Firefox 37.0.1 (Apr 3, 2015)

New in Firefox 37.0.1 RC 1 (Apr 3, 2015)

New in Firefox 38.0b1 Beta (Mar 31, 2015)

New in Firefox 37.0 (Mar 31, 2015)

New in Firefox 37.0 RC 1 (Mar 25, 2015)

New in Firefox 36.0.4 (Mar 23, 2015)

New in Firefox 36.0.3 (Mar 20, 2015)

New in Firefox 37.0b6 Beta (Mar 17, 2015)

New in Firefox 37.0b5 Beta (Mar 13, 2015)

New in Firefox 37.0b4 Beta (Mar 10, 2015)

New in Firefox 37.0b3 Beta (Mar 6, 2015)

New in Firefox 36.0.1 (Mar 6, 2015)

Fixed:
Disable the usage of the ANY DNS query type (1093983)
Fixed a startup crash with EMET (1137050)
Hello may become inactive until restart (1137469)
Print preferences may not be preserved (1136855)
Hello contact tabs may not be visible (1137141)
Accept hostnames that include an underscore character ("_") (1136616)
WebGL may use significant memory with Canvas2d (1137251)
Option -remote has been restored (1080319)
Fix a top crash
Fix some unexpected logout from Facebook or Google after restart
CSS gradients work on premultiplied colors
New:
Pinned tiles on the new tab page can be synced
Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.
Locale added: Uzbek (uz)
Changed
remote option removed
No longer accept insecure RC4 ciphers whenever possible
Phasing out Certificates with 1024-bit RSA Keys
Shut down hangs will now show the crash reporter before exiting the program
Add-on Compatibility
HTML5:
Support for the ECMAScript 6 Symbol data type added
unicode-range CSS descriptor implemented
CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries object-fit and object-position implemented.
Defines how and where the content of a replaced element is displayed isolation CSS property implemented.
Create a new stacking context to isolate groups of boxes to control which blend together
CSS3 will-change property implemented.
Hints the browser of elements that will be modified. The browser will perform some performance optimization for these
Improved ES6 generators for better performance
Changed JavaScript 'const' semantics to conform better to the ES6 specification.
The const declaration is now block-scoped and requires an initializer. It also can not be redeclared anymore.
Developer:
Eval sources now appear in the Debugger
Debug JavaScript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the Function constructor
DOM Promises inspection
Inspector: More paste options in markup view

New in Firefox 36.0.1 RC 1 (Mar 5, 2015)

New in Firefox 37.0b2 Beta (Mar 3, 2015)

New in Firefox 38.0a2 Developer (Feb 24, 2015)

New in Firefox 37.0b1 Beta (Feb 24, 2015)

New in Firefox 36.0 (Feb 24, 2015)

New in Firefox 36.0 RC 1 (Feb 23, 2015)

New in Firefox 36.0b10 Beta (Feb 18, 2015)

New in Firefox 36.0b9 Beta (Feb 13, 2015)

New in Firefox 36.0b8 Beta (Feb 10, 2015)

New in Firefox 36.0b7 Beta (Feb 6, 2015)

New in Firefox 36.0b6 Beta (Feb 3, 2015)

New in Firefox 36.0b5 Beta (Jan 31, 2015)

New in Firefox 36.0b4 Beta (Jan 27, 2015)

New in Firefox 35.0.1 (Jan 26, 2015)

New in Firefox 36.0b3 Beta (Jan 24, 2015)

New in Firefox 36.0b2 Beta (Jan 21, 2015)

New in Firefox 35.0 (Jan 14, 2015)

New in Firefox 36.0b1 Beta (Jan 14, 2015)

New in Firefox 35.0 RC 3 (Jan 9, 2015)

New in Firefox 35.0 RC 2 (Jan 7, 2015)

New in Firefox 35.0 RC 1 (Jan 6, 2015)

New in Firefox 35.0b8 Beta (Dec 31, 2014)

New in Firefox 35.0b6 Beta (Dec 23, 2014)

New in Firefox 35.0b5 Beta (Dec 19, 2014)

New in Firefox 35.0b4 Beta (Dec 17, 2014)

New in Firefox 35.0b3 Beta (Dec 12, 2014)

New in Firefox 35.0b2 Beta (Dec 9, 2014)

New in Firefox 35.0b1 Beta (Dec 2, 2014)

New in Firefox 34.0.5 (Dec 2, 2014)

New in Firefox 34.0.5 RC 1 (Nov 27, 2014)

New in Firefox 34.0 RC 2 (Nov 26, 2014)

New in Firefox 34.0 RC 1 (Nov 25, 2014)

New in Firefox 34.0b11 Beta (Nov 21, 2014)

New in Firefox 34.0b10 Beta (Nov 18, 2014)

New in Firefox 33.1.1 (Nov 15, 2014)

New in Firefox 34.0b9 Beta (Nov 14, 2014)

New in Firefox 34.0b8 Beta (Nov 11, 2014)

New in Firefox 33.1 (Nov 10, 2014)

New in Firefox 34.0b7 Beta (Nov 8, 2014)

New in Firefox 33.0.3 (Nov 7, 2014)

New in Firefox 33.1 RC 2 (Nov 6, 2014)

New in Firefox 34.0b6 Beta (Nov 4, 2014)

New in Firefox 34.0b5 Beta (Oct 31, 2014)

New in Firefox 33.1 RC 1 (Oct 30, 2014)

New in Firefox 33.0.2 (Oct 29, 2014)

New in Firefox 34.0b4 Beta (Oct 28, 2014)

New in Firefox 33.0.1 (Oct 25, 2014)

New in Firefox 34.0b3 Beta (Oct 24, 2014)

New in Firefox 33.0.1 RC 1 (Oct 22, 2014)

New in Firefox 34.0b2 Beta (Oct 21, 2014)

New in Firefox 34.0b1 Beta (Oct 14, 2014)

New in Firefox 33.0 (Oct 14, 2014)

New in Firefox 33.0 RC 2 (Oct 13, 2014)

New in Firefox 33.0 RC 1 (Oct 8, 2014)

New in Firefox 33.0b9 Beta (Oct 3, 2014)

New in Firefox 33.0b8 Beta (Oct 1, 2014)

New in Firefox 32.0.3 (Sep 24, 2014)

New in Firefox 32.0.3 RC 1 (Sep 24, 2014)

New in Firefox 33.0b6 Beta (Sep 23, 2014)

New in Firefox 33.0b5 Beta (Sep 19, 2014)

New in Firefox 32.0.2 (Sep 19, 2014)

New in Firefox 32.0.2 RC 1 (Sep 18, 2014)

New in Firefox 33.0b4 Beta (Sep 16, 2014)

New in Firefox 32.0.1 (Sep 13, 2014)

New in Firefox 33.0b3 Beta (Sep 12, 2014)

New in Firefox 33.0b2 Beta (Sep 9, 2014)

New in Firefox 33.0b1 Beta (Sep 5, 2014)

New in Firefox 32.0 (Sep 1, 2014)

New in Firefox 32.0b9 Beta (Aug 23, 2014)

New in Firefox 32.0b8 Beta (Aug 20, 2014)

New in Firefox 32.0b7 Beta (Aug 16, 2014)

New in Firefox 32.0b6 Beta (Aug 13, 2014)

New in Firefox 32.0b5 Beta (Aug 9, 2014)

New in Firefox 32.0b4 Beta (Aug 5, 2014)

New in Firefox 32.0b3 Beta (Aug 1, 2014)

New in Firefox 32.0b2 Beta (Jul 29, 2014)

New in Firefox 32.0b1 Beta (Jul 23, 2014)

New in Firefox 31.0 RC 1 (Jul 15, 2014)

New in Firefox 31.0b9 Beta (Jul 11, 2014)

New in Firefox 31.0b8 Beta (Jul 8, 2014)

New in Firefox 31.0b7 Beta (Jul 4, 2014)

New in Firefox 31.0b6 Beta (Jul 1, 2014)

New in Firefox 31.0b5 Beta (Jun 27, 2014)

New in Firefox 31.0b4 Beta (Jun 24, 2014)

New in Firefox 31.0b3 Beta (Jun 21, 2014)

New in Firefox 31.0b2 Beta (Jun 17, 2014)

New in Firefox 31.0b1 Beta (Jun 11, 2014)

New in Firefox 30.0 (Jun 11, 2014)

New in Firefox 30.0 RC 2 (Jun 6, 2014)

New in Firefox 30.0 RC 1 (Jun 4, 2014)

New in Firefox 30.0b9 Beta (May 30, 2014)

New in Firefox 30.0b8 Beta (May 28, 2014)

New in Firefox 30.0b7 Beta (May 23, 2014)

New in Firefox 30.0b6 Beta (May 21, 2014)

New in Firefox 30.0b5 Beta (May 16, 2014)

New in Firefox 30.0b4 Beta (May 14, 2014)

New in Firefox 30.0b3 Beta (May 9, 2014)

New in Firefox 29.0.1 RC 1 (May 6, 2014)

New in Firefox 30.0b2 Beta (May 6, 2014)

New in Firefox 30.0b1 Beta (Apr 30, 2014)

New in Firefox 29.0 (Apr 30, 2014)

What’s New:
New: Significant new customization mode makes it easy to personalize your Web experience to access the features you use the most (learn more)
New: A new, easy to access menu sits in the right hand corner of Firefox and includes popular browser controls
New: Sleek new tabs provide an overall smoother look and fade into the background when not active
New: An interactive onboarding tour to guide users through the new Firefox changes
New: The ability to set up Firefox Sync by creating a Firefox account (learn more)
New: Gamepad API finalized and enabled (learn more)
New: HTTPS used for Yahoo Searches performed in en-US locale
New: Malay [ma] locale added
Changed: Clicking on a W3C Web Notification will switch to the originating tab
Developer: 'box-sizing' (dropping the -moz- prefix) implemented (learn more)
Developer: Console object available in Web Workers (learn more)
Developer: Promises enabled by default (learn more)
Developer: SharedWorker enabled by default
Developer: implemented and enabled
Developer: implemented and enabled
Developer: Enabled ECMAScript Internationalization API
Developer: Add-on bar has been removed, content moved to navigation bar
Developer: Implemented URLSearchParams from the URL specification (see MDN for details )
Various security fixes:
MFSA 2014-47 Debugger can bypass XrayWrappers with JavaScript
MFSA 2014-46 Use-after-free in nsHostResolve
MFSA 2014-45 Incorrect IDNA domain name matching for wildcard certificates
MFSA 2014-44 Use-after-free in imgLoader while resizing images
MFSA 2014-43 Cross-site scripting (XSS) using history navigations
MFSA 2014-42 Privilege escalation through Web Notification API
MFSA 2014-41 Out-of-bounds write in Cairo
MFSA 2014-40 Firefox for Android addressbar suppression
MFSA 2014-39 Use-after-free in the Text Track Manager for HTML video
MFSA 2014-38 Buffer overflow when using non-XBL object as XBL
MFSA 2014-37 Out of bounds read while decoding JPG images
MFSA 2014-36 Web Audio memory corruption issues
MFSA 2014-35 Privilege escalation through Mozilla Maintenance Service Installer
MFSA 2014-34 Miscellaneous memory safety hazards (rv:29.0 / rv:24.5)

New in Firefox 29.0 RC 1 (Apr 23, 2014)

New in Firefox 29.0b9 Beta (Apr 18, 2014)

New in Firefox 29.0b8 Beta (Apr 15, 2014)

New in Firefox 29.0b7 Beta (Apr 11, 2014)

New in Firefox 29.0b6 Beta (Apr 8, 2014)

New in Firefox 29.0b5 Beta (Apr 4, 2014)

New in Firefox 29.0b4 Beta (Apr 4, 2014)

New in Firefox 29.0b3 Beta (Apr 4, 2014)

New in Firefox 29.0b2 Beta (Mar 25, 2014)

New in Firefox 28.0 (Mar 19, 2014)

New in Firefox 28.0b9 Beta (Mar 7, 2014)

New in Firefox 27.0.1 (Feb 14, 2014)

New in Firefox 27.0.1 RC 1 (Feb 13, 2014)

New in Firefox 27.0 (Feb 5, 2014)

New in Firefox 26.0 (Dec 10, 2013)

New in Firefox 26.0b1 Beta (Nov 5, 2013)

New in Firefox 25.0 (Oct 29, 2013)

New in Firefox 25.0b10 Beta (Oct 23, 2013)

New in Firefox 24.0 (Sep 17, 2013)

New in Firefox 23.0.1 (Aug 17, 2013)

New in Firefox 24.0b1 Beta (Aug 10, 2013)

New in Firefox 23.0 (Aug 7, 2013)

New in Firefox 23.0b1 Beta (Jun 28, 2013)

New in Firefox 22.0 (Jun 28, 2013)

New in Firefox 22.0b1 Beta (May 17, 2013)

New in Firefox 21.0 (May 15, 2013)

New in Firefox 20.0.1 (Apr 11, 2013)

New in Firefox 21.0b2 Beta (Apr 9, 2013)

New in Firefox 19.0.2 (Mar 8, 2013)

New in Firefox 19.0.1 (Feb 28, 2013)

New in Firefox 20.0b1 Beta (Feb 23, 2013)

New in Firefox 19.0 (Feb 20, 2013)

New in Firefox 19.0b6 Beta (Feb 13, 2013)

New in Firefox 18.0.1 (Jan 19, 2013)

New in Firefox 19.0b2 Beta (Jan 17, 2013)

New in Firefox 18.0 (Jan 8, 2013)

New in Firefox 17.0.1 (Dec 3, 2012)

New in Firefox 17.0 (Nov 20, 2012)

New in Firefox 16.0.2 (Oct 27, 2012)

New in Firefox 17.0b1 Beta (Oct 12, 2012)

New in Firefox 16.0.1 (Oct 12, 2012)

New in Firefox 15.0.1 (Sep 6, 2012)

New in Firefox 16.0b2 Beta (Sep 5, 2012)

New in Firefox 15.0 (Sep 5, 2012)

New in Firefox 15.0b2 Beta (Jul 25, 2012)

New in Firefox 14.0.1 (Jul 18, 2012)

New in Firefox 13.0.1 Final (Jun 16, 2012)

New in Firefox 13.0b2 Beta (May 2, 2012)

New in Firefox 13.0b1 Beta (Apr 26, 2012)

New in Firefox 12.0 Final (Apr 25, 2012)

Bug ID Summary:
704512 nsBMPDecoder::WriteInternal: Conditional jump or move depends on uninitialised value(s)
696324 Provide JS API for adding items to the Android menu
704520 Flash content does not have a placeholder if on Android 3.x
712714 Remove JOF_CALLOP
712719 NullPointerException at org.mozilla.gecko.GeckoAppShell.notifyIMEEnabled
720912 IonMonkey: Log the location of aborts
704539 channel.URI is undefined in Sync
720925 IonMonkey: Add Object comparison
696353 What happened to the arguments element IC ?
712738 Clang Static Analysis: Assigned value is garbage or undefined in content/media/nsBuiltinDecoder.cpp
720934 [meta] Android Sync 0.4 code drop
712743 Investigate if we could reduce traversing by checking if node is black
720941 Remove JSDOUBLE_COMPARE and content's equivalent DOUBLE_COMPARE
720952 [MacOSX] Some (or random?) builders report "Typelibs contain definitions of interface nsIDocCharset …
720955 pyxpt: Report IIDs when they differ
720957 contentLength is unsed in nsJSONListener::OnDataAvailable
712767 Send profile-before-change in netwerk/test/TestSTSParser.cpp
720962 don't build nsBrowserProfileMigratorUtils.cpp on Linux
704583 Add testing mode to FocusManager to address running webdriver tests concurrently
614476 gfxPangoFonts sets up grapheme cluster boundaries twice
696398 Need an api to analyze panning performance
720975 Switch to vertical layout only when the window width < 550px
688208 nsWindow for Android doesn't check whether the instance is destroying or not after dispatching an ev…
385106 design + implement actual register{Content,Protocol}Handler dialogs
712787 remove showScreenshot (dead code)
720981 Remove element.iQEventData when it's empty
712791 Crash when running Pageload Zippity tests, restoring on cnn.com
712793 Add missing browserIsRemote variable to test harness conditions
514198 freetype2 (cairo) doesn't compile on m-1.9.1
700434 Dismiss doorhangers on pressing back / tapping outside
614513 Crash in nsCacheService::DeactivateEntry during Linux Talos
696436 Rename MoCo-generated Aurora and Nightly Mac builds to "FirefoxAurora.app" and "FirefoxNightly.app"
712828 Mark slow tests as slow
712835 Add a memory reporter for the nsAtomTable
712837 Fix flakey jstest js1_5/extensions/regress-371636.js
696461 Ux Designs For Primary UI
712846 IonMonkey: implement OSI thunk on ARM
712847 warning C4099: 'nsCSSSelector' : type name first seen using 'struct' now seen using 'class'
712849 CSS top border is missing after assigning
712858 Remove lingering XPT_TDP_POINTER uses in XPConnect
90268 move plugins to content - plugins should withstand a reframe of the object frame
712867 Orion is white-on-white when using High Contrast Black color scheme
712868 tilt does not honour webgl.force-enabled preference
712870 skia works on non-tier1 platform
712876 Replace ISO-8859-9 (latin5, etc.) decoder with windows-1254 decoder per HTML5/Encoding spec
721069 Remove default case from filter switch statement
704687 Add MOZ_FINAL to classes which were NS_FINAL_CLASS but couldn't be MOZ_FINAL when nsDerivedSafe exis…
711368 gcli.css uses both box-sizing and -moz-box-sizing
721076 Prevent default on touch events should prevent long taps and double taps
704693 Android 4.0 (Ice Cream Sandwich) uses tablet-only Honeycomb theme
712887 Style Editor should always show the Save button on the currently edited style sheet
696512 Redirect clicks to clickable elements nearby (smart link tapping)
704706 Crash [@ nsSVGPathGeometryFrame::UpdateCoveredRegion] with SVG filter
712907 Assertion failure: lastProperty()->hasTable(), at js/src/jsscope.cpp:493
696532 Add-on manager
696535 "make check" and "pymake check" fail because build/'s own "make check" fails to find manifestparser
712923 [Mac] Heading elements h1 through h6 are not recognizable by VoiceOver
712927 [Mac] VoiceOver often repeats the document title as if it were a groupbox/fieldset heading/legend
704738 Page/content does not resize on device rotation/orientation change
712937 crash in nsTypedSelection::selectFrames
655594 Remove body margin on image documents
721131 Speed up build in content/svg/content/src - clean up #include directives in its header files
704758 "ASSERTION: null frame" in PresShell::HandleEvent with focus, navigation
712959 Image decoding prefs aren't reloaded when they change
696586 Allow access to XHR2 blob response in progress events
712973 Use InputReader from libui in gonk widget backend
614671 fuzzer for jpeg
704784 Only show scrollbars while panning (finger down), fade away on finger up
712990 Endian issue with YarrJIT
712999 Window.open doesn't work
721205 GLContext::fReadPixels uses format GL_BGRA on Android, causing GL_INVALID_OPERATION
672054 Remove nsIDOMNSUIEvent, nsIDOMNSMouseEvent
721208 Tab screenshots can hose the gecko event loop
721209 tab screenshots unnecessarily big for background tabs
721214 Use Tabs.selectTab to select a new tab instead of sending a Tab:Selected message to gecko
716853 IonMonkey: Mark the invalidator thunk
721216 Bitmap compression on main thread causes the tab strip to take a long time to appear
696647 Remove unused (invalid) MathML atoms
721230 Implement stub compressed texture support
696662 HTTP Auth headers cannot be modified after http-on-modify-request got fired
631138 Write a comment explaining Shapes and the property tree
696379 file:/// urls and about: urls don't seem to be scrollable
696683 handleGeckoMessage throws java.lang.NullPointerException on startup
713068 IonMonkey: Invalidation leaks IonScripts
713069 Remove AutoEnterCompartment calls from finalizers and assert
721265 Firefox migrator: form history support
721271 Post-0.3 Android Sync Aurora uplift
721272 IonMonkey: TypeObject guards in TypeBarriers are always-taken
720431 Can't close Style Editor with cmd+w
704575 Union dirty rects instead of painting all of them
680327 Use NS_LITERAL_CSTRING instead of nsDependentCString
696386 Crash on Quit [@ JS_ResumeRequest]
721294 Clean up nsIPresShell::DidPaint/WillPaint related code
666349 Update WebSocket API to latest draft
721298 Fennec XUL has no suggested addons
721301 font.size.inflation.minTwips is set for XUL Fennec
704918 GCLI 'console clear' doesn't clear everything in the console
704922 Racy bookmark handling in Tab.java
721313 Don't run normal end-of-parse code when parsing full doc from a string
557476 [MathML3] munder, mover, munderover: add support for the align attribute
672166 Merge nsIScreen_MOZILLA_2_0_BRANCH into nsIScreen
721320 Improve BrowserDB / LocalBrowserDB performance
696748 [ARM] Assertion failure: (inst & mask) == expected, at ../methodjit/ICChecker.h:56
617203 "First character must be the start of a cluster ..." assertion failure with pango-graphite
713149 hal_impl has no method GetCurrentBatteryInformation
721345 crash js::ContextStack::popInvokeArgs, Browser Crashes when close a tab(heavy script site)
721350 Style Editor auto-scroll to the selected style sheet is annoying
721353 Fix invisible outline regression introduced by bug 719022
704970 Favicon missing on URL bar; visible in awesome screen
713167 Microsoft.VC80.CRT SideBySide errors, browsercomps.dll
713168 Hack in support for maguro touch screen
713169 gfx/skia/src/core/SkAdvancedTypefaceMetrics.cpp:163: error: explicit instantiation of non-template '…
598482 Hook up invalidation flushing to the refresh driver and make all painting asynchronous
713172 Download Manager breaks shutdown sanitization, forcing sanitization at startup instead
715513 [Azure] Implement text in Cairo backend
74206 Potential discrepancies in some variable definitions
713183 Split all the property-access ops into property, element, special, and by-value ops
705000 [New Tab Page] Black labels don't match Windows 7/XP color theme
699134 Extension block request: Roboform
713209 Crash [@ __memcpy_ssse3_rep] through JSRope::flatten
713214 [IncrementalGC] Assertion failure: started, at js/src/jsgc.cpp:1848
696832 Ux Designs for Menu
696833 Ux Designs for Awesome Screen
705026 Kindle Fire: Menu on has blanked out items
721413 [New Tab Page] Load links lazily when opening a new tab
401931 Tabbrowser performance optimizations
721420 WantAllTraces should disable Skippable CC optimizations
713229 configure only requires NSPR 4.8.8, but we require NSPR >= 4.9 beta 4
721422 [Page Thumbnails] Re-enable tests and make them work with URI_DANGEROUS_TO_LOAD
713232 Built in Profiler hangs the browser on Windows
701870 Make sure that setting a preference, then quiting, results in the preference being saved
565791 Show all previously installed lightweight themes in AOM
713260 Add a Tilt test for content location changes
664109 Requests for changes to the TLD whitelist for IDN, to add .ee
713266 Update ANGLE to r930
721466 Compiling with graphite enabled is failing with VS2010
721467 Add a codepath to only use glTexImage2D instead of glTexSubImage2D when texture uploading in GLConte…
713276 Upgrade WebGL conformance test suite to r16456
713278 Teach NS_StackWalk to walk the stack of other threads too on Windows
713283 Profile migration takes forever
705092 Kinetic scrolling on web content is a bit too slow now
692614 IndexedDB: Support all spec'ed key types, including arrays
713287 Animation for closing the last tab has a slight delay near the end when the tab bar overflows
721484 Contenteditable demo doesn't work with touch events enabled
615001 Fix readPixels (pass the gl-enums-test.html test)
713311 give the remaining scope objects typed interfaces
580368 Stop shipping Oriya [or] Mac builds on 3.6.x
721510 Always decode at least one chunk when decoding a rasterimage
721511 [cairo-dwrite] avoid excessive buffer allocation/deallocation when drawing glyph runs
721515 Add Documents, elements and textnodes to BBP
705145 Multiple selection lists cannot be scrolled
705146 Selected entries are dismissed if a tap is performed over a multi-selection list
713340 jsShell_ErrorFormatString arrays are too large
524925 Avoid reflows for transform changes
721535 [Firefox] "Warning: package error or possible missing or unnecessary file: bin/components/chardet.xp…
721543 Call forgetSkippable before CC
721547 don't generate large screenshot when tab menu is opening
721548 Cleanup purple buffer during cycle-collector-forget-skippable
705166 Entering text in inputs fields has regressed in performance; lagged input
721551 Need split builds for Fennec that serve XUL Fennec for tablets and native Fennec for phones
713360 [highlighter] Breadcrumbs bar started looking funny after bug 497995 landed
705171 Use RENDERMODE_WHEN_DIRTY instead of RENDERMODE_CONTINUOUSLY
705173 Crash with canvas
713369 Between 30 min-1hr Firefox crashes when it is using WEB GL on Google Maps.
721564 Get module information for the profiler on Windows
713381 Crash [@ nsRefPtr::operator->() | nsBuiltinDecoderStateMachine::ScheduleStateMachi…
721577 Race condition in about:home for tabs from last time
713391 There should be a test to make sure Tilt is opened via the access key
705200 Add mozilla::gfx::Matrix::IsIdentity()
705204 Add mozilla::gfx::Matrix::operator!= and operator==
721589 Intermittent M4 failure: /tests/image/test/mochitest/test_error_events.html | Got onload for error-l…
680635 IonMonkey: JSON output omits LPhi nodes.
705212 [ICS] - Dim ic_awesomebar_go.png and ic_awesomebar_search.png
713408 Don't clutter log with history entries in Profile Migrator
713415 Stop trying to package dom_threads.xpt, since it was removed by bug 649537
713416 Remove unnecessary class nsUniCharEntry
713417 Crash [@ nsIRange::UnregisterCommonAncestor] with designMode
713418 Stop trying to package MacOS/Contents/Plug-Ins/ since we haven't put anything in there since bug 520…
697040 The Script Debugger onNewScript notifications don't always fire
713426 RIL: implement 3G data call APIs
713427 crash IsElementVisible
721625 Linux Repacks broken after Bug 719659
721627 Don't return nsRefPtr/nsCOMPtr from nsDisplayImage
705244 Properties window in inspector has the values hidden (overflow-x) when window is open
172768 xft tracking bug
721634 Compare Startup times for Multi-Locale vs. Single Locale Builds
721636 IonMonkey: patching for ICs should invalidate the instruction cache on ARM
697063 Tabs.getSelectedTab returns null until Gecko starts and will cause crashes
647914 Horizontal and vertical SVG paths are omitted from bbox calculations if they have siblings
669138 submitting . IDNccTLD
697070 Tab menu favicon takes on previous favicon if no favicon present in document
713462 Investigate if black content lists don't need to be traversed
713463 Support JM+TI for architectures without native square root
713464 English labels displayed initially on multilanguage apk instead of localized strings
721658 Temporarily enable accessibility for nightly builds off the accessibility projects branch
688891 Change Sprinter to js::CStringBuilder backed by js::Vector storage
697085 Link to mac malloc headers in memory/jemalloc/osx_zone_types.h
697086 Content permission notifications not dismissed on page dismiss
697087 Multiple notifications content permission prompt
721667 Incomplete framebuffer abort in mozilla::gl::GLContext::SetBlitFramebufferForDestTexture with "error…
697095 Unable to open more tabs than current screen-height permits in landscape view
697098 Tab panel scrolls to top during current and active page load
688908 Update .asia listing in PSL comment
697110 Support doorhangers for popup blocking
718297 Add EnumerateAll to nsPropertyTable
664344 fuzz testing against websockets client implementation
713498 Allow keyCode and charCode to be different in the temporary mozKeyboard interface
713499 "ASSERTION: null parent matrix"
713502 input event should be fired after compositionupdate
713503 prefetch urls from known url shortening sites before gecko is running
697120 Show favicon on all entries in awesomebar
697121 Handle search entry focus properly when switching tabs
697122 Show only label on awesome bar tabs while keeping native tab look
525095 Artifacts left behind when reducing horizontal scale of text with font-family="sans-serif"
713517 Add IPC support for alpha
713519 getCharsetAlias should throw for unknown character sets
713526 IonMonkey: stub + PIC for SETPROP and SETNAME
697144 Unable to interact with aboutCertError
705347 Crash [@ nsCOMPtr::nsCOMPtr]
566092 Inspector highlight doesn't handle reflows correctly
721741 Make Flash plugins work on Ice Cream Sandwich (Android 4.0)
705358 Over scroll / scroll should not exist when page is fully zoomed out and all the content is in the vi…
721744 configure: error: mozilla/js/src/ctypes/libffi/configure failed for ctypes/libffi
713553 Remove GetRTStringByIndex
713554 Remove xpc_SameScope declaration
705365 Set the plugin hang timeout shorter than the Firefox hang timeout
713560 MOZ_STATIC_ASSERT doesn't use 'reason' as often as it could
713571 IonMonkey: Compile JSOP_PICK & JSOP_SWAP
713572 annoying black flicker on menus and dropdowns
684177 Intermittent browser_styleinspector.js | Test timed out
639848 Add method to webconsole.api to add a button to the console toolbar
713578 java.lang.NullPointerException at org.mozilla.gecko.Tabs.closeTab(Tabs.java:147)
680816 Reusing an XHR2 object with responseType of "arraybuffer" does not work
713586 java.lang.ArrayIndexOutOfBoundsException at org.mozilla.gecko.ui.PanZoomController$BounceRunnable.ad…
713597 Crash removing full-screen element during "resize" event
697215 Cannot scroll panel on OS X
713600 MasterPassword helper is missing _tokenName
713610 "ASSERTION: 2nd pass should never guess wrong" in TextOverflow::ExamineLineFrames
713612 add closing curly bracket to avoid disrupting the rest of the CSS
664466 Sometimes hud is undefined in HS_deactivateHUDForContext
713622 Enable elfhack
705451 html anchors do not always update in url bar
713645 Remove unnecessary jscntxt.h inclusions
721855 Honour gfx.canvas.azure.prefer-skia pref on OS X
697282 IonMonkey: Support JSOP_CALLPROP
713676 Keyboard shortcuts (ESC, RETURN) no longer work if the content area loses focus.
590797 CSS editor panel should be resizable
713687 Network API: Android backend
618660 Tracking Bug for AIX 5L port of Firefox 3.6 branch
713359 CSS cut short in Style Editor
713693 IonMonkey: Compile Add with String and Objects (Assertion failure: NYI, at js/src/ion/Lowering.cpp:3…
689118 Firefox- Crash Report [@ js::AutoCompartment::AutoCompartment ]
721888 Fennec native build doesn't flag java warnings as errors
664547 IM: LICM (Loop Invariant Code Motion)
631801 Available() does not work on SSL Stream
623610 Remove support for geostd8
713728 Workers: Need a shutdown observer topic
713729 FlingRunnable runs constantly after panning and releasing without flinging
721068 update to latest graphite2 code from upstream
713747 Rip out non-UniversalXPConnect privilege manager functionality
713754 Native key iterators should have an array of JSString*
713755 Use constructors to create a. and a[] parse nodes
713756 Remove js/src/tests/src/jstests.jar
713759 Split PNK_INC and PNK_DEC into pre- and post- variants, rather than depending on an op for this
705572 Kindle Fire: YouTube videos do not open in unavailable YouTube App
713773 Ensure GC Statistics totals are initialized
369710 No talking alerts
713778 nsICycleCollectorListener should not enable trace_all by default
713780 Performance : regression on performance startup between 12/12 and 12/13
715615 nsHTMLTableElement CC handling is suspicious
713792 stop QueryInterface()ing to nsIAccessibleImage internally
713803 JNI() verses mJNIEnv in widget/src/android/*
722003 "ASSERTION: null nsSVGPathGeometry frame" and crash
722011 [skia] Comma at end of enum list is not valid in c++
722014 large number of reftest failures, possibly related to incorrect font-size inflation?
713825 Move nsIDocCharset and nsIDocumentCharsetInfo into docshell
713828 Stop styling page-proxy-stack
713829 Remove unused brandFullName string in nsGNOMEShellService::SetDefaultBrowser
705640 Implement DOMError as defined in DOM 4
713835 Style Editor search box shouldn't be round on Linux
713841 Too much padding in back and forward button tooltips
722046 remove extra semicolon after NS_DECl_EVENT_HANDLER
705663 Fix braindead WebGLTexture::HasImageInfoAt
713856 Dynamic change of DOM in lists before block element creates blank line
705669 Firefox Crash Report [@ js_ReportOutOfMemory ]
697479 Implement Harmony simple Map and Set builtins
713865 Don't traverse XBL and XUL protos so much
713866 Remove nsXMLEncoding.h
713867 IonMonkey: fix arrayPrototypeHasIndexedProperty
713870 IonMonkey: don't crash when scripts are invalidated during compilation
713874 Black thumbnails are produced by GeckoSoftwareLayerClient.getBitmap()
713887 Javascript error when using the menu quit to quit fennec
599207 "TEST-UNEXPECTED-FAIL | /tests/content/base/test/test_websocket.html | test 2 took too long to finis…
672944 text-overflow ellipsis with -moz-box
703347 Add a background image for the "void beneath" the web
689337 Desktop notification interfaces should not be marked 'function'
713915 IonMonkey: ARM implement some more NYI's, and fix our stack tracking
713916 DOMGCFinishedCallback should schedule just GC buffer shrinking, not a shrinking GC
713922 Don't allow user to use empty password for master password
721099 Update mozilla-aurora to NSPR 4.9 beta 6
722117 "ASSERTION: CalcDifference() returned bigger hint than MaxDifference()" with blink
722118 make package fails if --disable-tests (Fennec Native)
697549 Use NativeWindow.doorhanger in ContentPermissionPrompt.js
713934 Update PSM to use SSL_AuthCertificateComplete instead of SSL_RestartHandshakeAfterAuthCertificate
713935 Fix debug builds on gonk due not having HAVE_SYS_UIO_H defined
713936 Update mozilla-central + mozilla-aurora +mozilla-beta to NSS 3.13.2 final release (requires NSPR 4.9…
681170 aspect-ratio-1a.xhtml, canvas-1b.xhtml, aspect-ratio-3a.xhtml, aspect-ratio-3b.xhtml, aspect-ratio-1…
713944 "Assertion failure: (shape->writable()),"
566489 Enable inline autocomplete again, but make it smarter (perceived performance)
713952 IonMonkey: Crash in math-cordic with --ion -n
722167 Severe Graphics corruption
664824 TI+JM: make JSOP_IN fast
713977 IonMonkey: TI assertion trying to inline with --ion -n
713991 Geolocation fails when used with large number of access points
713997 IonMonkey: On-Stack Invalidation crash in jaeger/inline/undefinedLocal.js
410904 http_referer request not being sent with embedded flash
715652 [Azure] Implement significantly more of the 2D API for Cairo
711557 Expose a friend API for js::ObjectClass
722211 Update WebGL conformance tests to r16765 and adapt mochitest to harness changes
714027 Devtools sidebar box has a weird background when opened on Windows
714029 Avoid jsctypes-test dependency on the xpcom glue
714035 Remove application.(telnet|tn3270|rlogin)
697659 Use doorhangers for Password Manager
714052 Remove JS_NEITHER
714057 Remove uintn users from XPConnect
714062 Add-ons Manager page should be opened once, e.g. tapping on "Add-ons" should switch to opened about:…
673105 Implement high-resolution platform timers for Tier I platforms (umbrella bug)
714066 Missed FreeChunkList call in JSRuntime::onOutOfMemory and other fixes
714067 Last component of Arabic ligature is sometimes duplicated
673108 Modifying a `range` in the selection, having multiple selection in the same node, ends up to corrupt…
714078 Code in AudioSession::OnSessionDisconnected needs to run asynchronously
714083 Update app.support.baseURL to point to support.mozilla.org
697701 Support double-tap gesture to zoom
607593 WebGL crash [@mozilla::gl::GLContext::fFramebufferRenderbuffer]
721129 Incorrect BigInteger comparison in JPakeCrypto
697720 Add 'Clear private data' preference
697726 Stop
714115 CF_HTML Bug when pasting from Word and Excel if you use a , instead of . for your decimal point
697732 Back/forward from javascript do not update Java-side state
580502 [meta] CSS styling for Console
714132 Possible double release of a NSColor
705945 "ASSERTION: MemoryReporterMallocSizeOf: computedSize is too small" (JSObject::sizeOfSlotsArray)
714140 Charlton Company trademark notice can be removed from About dialog
714148 NullPointerException at org.mozilla.gecko.db.AndroidBrowserDB.updateFaviconForUrl
632233 XULBrowserWindow.onLocationChange looks for a "disablefastfind" attribute in all content documents b…
566700 remove sharp variables
697773 Cannot type in AwesomeBar URL bar with hard keyboard
714162 Don't traverse certainly alive selections
714164 cmd_scrollLineDown/Up have disappeared
714169 File js/public/HashTable.h cause warning
714178 Expose CPP from configure to the build system
689605 [meta] GCLI should be ready to be shipped, preffed on
714183 Import downstream widget/src/gonk changes from b2g
599498 Web Console CSS aesthetics
545015 configure sometimes fails with "rm: cannot lstat `conftest.exe': Permission denied" followed by "C++…
607692 Consider inlining parseInt for numeric (double or int) arguments
705997 Remove additional Java Consoles
714205 IonMonkey: Merge some framePushed changes to x86
697830 Delayed DNS prefetch queue is disabled for e10s
714218 Move element/property/special-specific handling for a few classes out of getGeneric methods into spe…
525816 XMLHttpRequest should allow to specify a network timeout in ms (for async requests)
714234 Handle window.close() via DOMWindowClose
697858 Restore tabs from previous session, including history
591363 (in)visible state is not always correct?
714250 Optimize nsTransactionManager traversing
714256 Remove nsTransactionManager::Lock()/Unlock()
714258 rv unused in nsEditorController::RegisterEditorCommands
714264 Move JS memory reporting code and data structures from XPCJSRuntime.cpp to js/src
706079 ignore aria-activedescendant referent having no ARIA role
714272 Desktop icon on Tools/Options panel disappears if choosing to 'Save files to' Desktop
714276 nsDOMWindowUtils::NodesFromRect doesn't have a security check
714280 Make gcMaxBytes a hard limit
714281 Show the all tabs button only when the tab strip overflows
714285 No context menu on long tap on inputs without type=text attribute
714286 Cycle collection log should be written to a place where the process can write to
583218 "Web Console" menu item should be checked when the Web Console is open
714306 Service handle leak in netwerk/base/src/nsAutodialWin.cpp
714307 Flickering display in emulator (need to copy updated region from front->back buffer in /dev/graphics…
714312 detect machine/endian.h to get endianess on BSD systems
714315 Use DirReaderFallback on OpenBSD, getdents64 is not defined there
714332 Fix uint64 types usage in dom/workers and dom/base
714342 page-proxy-stack should be a rather than a
714344 Intermittent Assertion failure: !noAvailableArenas() (during browser_bug687573_vscroll.js ?) or Talo…
714347 pymake: $(sort) should remove duplicates
618770 Titlebar gradient breaks off abruptly at the toolbar in windows without tab bar when tabs are set on…
714350 Remove nsXPConnect::RestoreWrappedNativePrototype
714353 Remove nsIXPCScriptable::Trace
714363 Remove XPCWrappedNativeScope::mPrototypeJSFunction
714365 DictionaryHelpers.cpp gets rebuilt on every build
706186 xulrunner-stub.exe depends on mozutils.dll
607854 SVGTests interface is not implemented
714393 IonMonkey: integer-2 fails with type inference assert
722586 Correctly update active/inactive browsers
714396 IonMonkey: segfault walking the stack on ARM
714397 IonMonkey: Cannot inline functions with too many provided arguments.
707927 IonMonkey: Compile JSOP_MOD
714411 Silence 294 warnings when building with clang due to -Wmismatched-tags
714418 Remove nsIXPCScriptable::DONT_SHARE_PROTOTYPE (and make all XPCWNProtos be shared)
706227 Add way for JS_GC API users to give detailed reason for invocation
714420 object-aspect-ratio-2a.xhtml | assertion count 1 is more than expected 0 "ASSERTION: RECURSION_LEVEL…
714422 Silence 271 warnings due to GetCurrentProcessArchitecture being a *static* inline, never used, when …
714428 IonMonkey: remove spillRegs()
703434 Add support for Qt resource files (qrc) which possible to pre-compile with rcc compiler
714445 nsWebMReader::ReadMetadata reads preferences off the main thread
714458 Don't include jscntxt.h in xpcprivate.h
714459 Rename RadioManager / nsIRadioWorker
722655 Crash on about:home if tab title is not defined
493280 unify font family/style management and matching across platforms
616169 Update the LIR opcode table file format to make adding opcodes easier
698095 Tab count increment/decrement needs animation
657141 Page scroll is lagged and slow
198391 Copy in view source window inserts not existing empty lines
689913 Assertion failed: (false), function writeConstantUnion
714496 Intermittent TEST-UNEXPECTED-PASS test_smilCSSInherit.xhtml | deeply-inherited font-size halfway thr…
673543 crash nsDiskCacheMap::DeleteRecord
714509 russia.ru zombie compartment due to "super start" extension
689939 Infobar disappears when node fills top and bottom of screen during page zoom in highlighter
714519 [quirks] list bullet/number disappears when item that wraps has all contents in 2 nested inlines and…
706340 add gfxinfo data to telemetry data
714542 Mac build uses pretty naming for *.checksums files
714547 Array passed from another domain behaves like Object
722752 Home page shows set up banner even though Sync was just set up
714562 Intermittent Assertion failure: info.prevp, at /builds/slave/m-in-osx64-dbg/build/js/src/jsgc.cpp:77…
714565 Concurrency issue in BrowserProvider.java.in
714572 Fix nearly all warnings building image/ on Linux, debug, with clang
540984 Foxyproxy not aligned correctly in the Tools menu
714580 JS_ASSERT_IF prints extra parens on failure
477015 Create namerules based tests for accessible name of images.
714587 "ASSERTION: unexpected disconnected nodes" with full screen, selectAllChildren
567135 Need CFI for xptcstubs_arm
714594 Don't list app tabs in the all tabs menu
714597 GfxInfoCollector.h used in Thebes API depends on string internal api
591718 getBoundingClientRect needs to take transforms into account
714600 Assertion failure: [infer failure] Missing type pushed 0: [0xf6c001c0], at jsinfer.cpp:349
657260 "ASSERTION: nsTDependentString must wrap only null-terminated strings" with btoa()
714607 jit-test/tests/basic/bug680217.js takes a long time
714613 Dead code in nsShiftJISToUnicode::Convert
718484 Merge browser_privatebrowsing_beforeunload_enter.js and browser_privatebrowsing_beforeunload_exit.js…
698237 Invalidate affected frames when a range in a selection is modified
714633 Release message manager related data structures more aggressively
706442 Firefox 10.0a2 Crash Report [@ js::LifoAlloc::getOrCreateChunk(unsigned int) ]
190347 Let FreeType2 handle Type1/etc rendering too.
714639 Closing browser tab from Silverlight crashes Firefox @ js::ContextStack::popInvokeArgs
714646 jsgc.cpp fails to compile on Win64 GCC
698263 Rename mozilla::imagelib namespaces to mozilla::image
714649 Make ExpirationTrackerObserver final
649114 Text-anchor middle is not computed correctly for element scaled to 0
706460 Unable to scroll down to thumbnail listing on new about:home in landscape
714656 [IncrementalGC] Assertion failure: numSavedRoots < NROOTS, at jsgc.cpp:1077
731043 Builds from mozilla-beta shouldn't default to official branding
706472 IonMonkey: not inlining function call in 3bit-bits-in-byte
714669 nshttpconnection::pushback() asserts incorrectly
714676 IonMonkey: Frame descriptors are not always correct
714686 IonMonkey: Unbox OSR Values.
714694 Add IdleService to gonk backend
714696 rm lingering remains of tracer in js::Value
714697 rm lingering remains of JSCLASS_CONSTRUCT_PROTOTYPE
714708 NullPointerException at GeckoInputConnection.notifyIME
714710 LayerRenderer.checkFrameRateMonitorEnabled should use start() instead of run()
699385 Remove support for pre-Windows 7 SDKs
714713 Comparison of strings using ==
714715 Variable is used before a null check in GeckoApp.launch
714717 nsIdleService: timeout event doesn't fire regularly on non polling mode
698335 "ASSERTION: Invalid offset" with bidi, -moz-column, :first-letter
714723 CAOpenGLLayer based plugins not being rendered on Firefox 9.0.1
714727 IonMonkey: Assertion failure: (live->empty()), at LinearScan.cpp:632
714728 Remove jsword?
665578 [ATI on Mac] WebGL demo "To the Road of Ribbon" crashes in useProgram [@ ATIRadeonX3000GLDriver@0x5a…
411627 Need regression tests for GIF image decoding
690164 white space between hidden elements causes line break in list item elements
714741 Fix the spelling of the comment in SpdySession.h
493558 File > Import menuitem but no Export menuitem in Library menu bar [Mac]
706554 Add nsRefPtrHashKey
665597 Include margin calculations in FinishAndStoreOverflow
714752 Make imgIContainerObserver::FrameChanged take an imgIRequest*
722945 Transactional behavior for store (don't return stored records in subsequent fetch)
714760 Remove obsolete testing code for the old parser
714762 ArrayIndexOutOfBoundsException at Tabs.getTabAt
690187 entire text in cell being replaced by ellipsis from text-overflow
706574 show native about:home in onCreate()
698384 Document.createNodeIterator's 2nd and 3rd parameter should be optional, and remove the 4th (entityRe…
698385 Document.createTreeWalker's 2nd and 3rd parameter should be optional
641047 Analyze ai-astar performance
714777 Refactor fragment parsing out of nsHtml5Parser
665628 Memory leaks with jQuery in FF 4
706615 Panning motion slows, then jerks
657076 e10s FTP: Improve error handling in FTPChildChannel
714814 IonMonkey: ReflowTypeInfo does not use the right PC
698436 Switch to custom spinner
706230 GCLI should have a jump-to-scratchpad feature
706636 Create empty state thumbnail, just in case
714829 Unused StringBuffer is created in GeckoApp.addEnvToIntent
706644 Going back from about:home still displays about:home
712572 hang forever in bilibili.tv since 20111220 nightly
706663 Empty Favicons on about:home look like checkboxes
706667 Make about:home pretty
706674 WebGLFramebufferAttachment's are not WebGLRectangleObject's
714874 Fix Java warnings for Fennec and Sync
706684 Resting your hand on the device causes zoom to freak out
706690 Content scaling via CSS transform is jagged while layers are active
583816 Tab should not move to the page when there's nothing to complete in the Web Console
714894 Remove tracer specific JSOP
729453 Reduce nsTArray::SwapArrayElements's stack allocation from 8kb to something much smaller
706724 firefox-beta repository: file_util.cc:228:35: error: ‘ftruncate’ was not declared in this scope
714921 IndexedDB: deleteDatabase is broken
706733 Chrome migrator shouldn't duplicate type constants
714942 Implement minimal UI for Jump to line in the Source Editor
714949 IonMonkey: Implement {Load,Store}element{T,V} on ARM
714950 Unable to see characters typed in landscape fullscreen VKB
714951 [Mac] Aurora & Nightly icons incorrectly positioned in mounted DMG image's finder window
690376 Crash [@ JSObject::nonNativeSetProperty]
723151 No drawable resources defined for eclair
328056 Pressing Ctrl+Y in an empty input field invisibly adds \r\n to the end
714967 Export mozilla::services::Get* to external consumers as well
714972 Opening links from external apps doesn't work after OOM
714974 RIL: Turn off debug output by default
714976 [mac] the Role description for the web content is AXWebArea instead of "HTML Content"
698593 Ux Designs for Preferences
698598 Ux Designs for Doorhanger Notifications
723200 Enable multitouch
706822 Delay when opening the AwesomeScreen and intermittent UI pauses when scrolling through listing of it…
706830 pressing "back" doesn't return user to about:home
698652 Minimum font size and canvas don't get along very well
715045 Remove old vc support code
715048 .mozconfig.mk is generated into $topsrcdir instead of the $objdir
706859 Update the script loading code in the debugger
715056 "ASSERTION: wrong node" and crash [@ nsIRange::UnregisterCommonAncestor]
715059 Make ParseNode non-copyable
198964 Enable smooth scrolling by default
706876 no "site options" in native ui menu
715074 SIGBUS on unaligned access in Key::EncodeNumber
706886 Line-through disappears after editing overridden rule in style inspector
715088 IonMonkey: Assertion failure: no payload..., at CodeGenerator-x86.cpp:137
706897 Intermittent test_destinationURI_annotation.xul | Test timed out, followed by a cascade of other err…
665939 Uncommon ligatures used by default
717198 Remove tag observers
575830 Image zoom (Page zoom) is reset when I switch tabs
633177 initprop/initelem, sharp variables and duplicated property names
715098 nsICacheMetadata::visitMetaData blows up in debug mode if the visitor returns false
715099 Convert nsProfileMigrator to JS so we can use JS modules on migration
715103 Move parser unblocking management from nsContentSink to nsScriptLoader
706914 JM: Compile large scripts in chunks
715110 Don't use getPreventDefault in editor
715112 Remove duplicate document.close() state tracking
715113 Pull updated Snappy revision (>=r56)
10606 Uninitialized memory error caused by nsMargin
526703 Screen readers announce ARIA list items, tree items, and listbox items as "not selected"
715123 Style Sheet Titles should be moved someplace less confusing in the Style Editor in Vertical Orientat…
690552 ScratchPad should display exceptions as a comment, just as it does for results
715129 fp.appendFilters(nsIFilePicker.filterApps) does not show ".exe" file in the file picker
723323 Add the extensions.getAddons.getWithPerformance.url to mobile default prefs
696495 texture-mips.html failures might be workaroundable by setting minification filter before glGenerateM…
723349 Fix params in addTab on session restore failure
715162 Move LazyIdleThread to XPCOM
715163 Mouse click + drag causing Tilt to Translate instead of Rotate on First Open
715164 ArrayIndexOutOfBoundsException in advanceBounce()
706984 NullPointerException @ getProfileDir(GeckoApp.java:705) on startup (thrown but caught)
387503 Make nsINode bits into an enum, move a macro into an inline function
715185 Remove 'using namespace mozilla::dom' from nsDOMFile.h
534963 [MathML3] Mechanisms for controlling the Directionality of layout
715190 glEGLImageTargetTexture2DOES shows error 501 frequently
715198 browser is loading compressed data directly to the page
592320 [meta] A new Inspector for analyzing page elements
715201 GC: missing barriers in BaseShape's new constructor
715203 -moz-column-fill property does not update from within script correctly
715204 Non-ascii titles are displayed as garbage during session restore
715206 Remove XPConnect from IDB's LOCAL_INCLUDES (again)
698828 Adding bookmarks doesn't work (Honeycomb, maybe ICS?)
719949 Unmark listeners in XHR, WebSocket and EventSource if the object is black
715232 Crash in glCopyTexImage2D on Gonk, when creating an intermediate container-layer fbo during composit…
715857 Disable a11y tests that put in random XUL documents and expect it to work
715240 DECODE_ON_DRAW_LATENCY is wrong
707049 Dynamic analysis for identifying moving GC hazards
707051 Failure to mark some shapes during delayed marking
715260 Remove Web Apps shortcut intent from allowing one to add the Android widget
715265 don't allocate a JSString per element in array_sort when there is no comparator
715275 No favicon / default favicon image is very fuzzy
715276 IonMonkey: CallVM with Value& and double.
723472 reftest graphite-03a causes spurious "out of memory" crash due to zero-sized allocation request
707672 openUILink[In] behavior should not be determined by browser.tabs.loadBookmarksInBackground
707090 DOMApplicationRegistry (Webapps.jsm) must not do any mainthread I/O
715284 websocketchannel.cpp 2377 compiler warning
717231 Downloads are not added to the Download Manager (stock ICS 4.0.3)
707096 We need a public API for TypedArray / ArrayBuffer
651695 Massive memory leak running CubicVR demo
698917 Be smarter about removing & from prompt labels
715303 No focus on select when tapping on selects
690732 TI: Assertion failure: nativeContains(cx, *shape), at jsscope.cpp:891
584237 [meta] Compartments
649778 document.write may cause a document to be written to disk cache even when the page has Cache-Control…
707124 Add URI to fetch schema version in BrowserProvider
715325 shutdown indexedDB during xpcom-shutdown
715326 Loading about:config initially via adb shell shows zoomed-in viewport
715328 Add some more MOZ_FINAL
715332 IonMonkey: Assertion failure: Tag == OP2, at ./ion/arm/Assembler-arm.h:999
698949 Refuse untrusted keypress events in editor
707150 Add mechanism to enable/disable Fennec's local bookmarks/history DB
710414 Split out the conservative testing for a GCThing from marking it
707162 regression in GC scheduling between Firefox 9 and 10?
715357 IonMonkey: Fail invalidation properly
723550 Lots of base64 decode errors in logcat
682611 decom nsRange
682625 Crash, null pointer deref [@ mozilla::plugins::PluginInstanceParent::BackgroundDescriptor ]
707207 Get an object signing certificate (or two!) for signing the hotfix add-ons
715405 Add a type-safe linked list class
567956 Sometimes inspector panels take up space in browser window as though they are a normal box
707223 AzureBackend is not aligned with the other Graphics information in about:support
715417 Eliminate getPrincipalArray and globalPrivilegesEnabled from JSPrincipals
715418 Test case for bug 650995 has wrong name: test_bug650955.js should be named test_bug650995.js
592552 History is shared among all Web Console instances
699052 Android back button should close the selected tab and return to the previous tab when possible
715453 Remove computedSize from nsMallocSizeOfFun
715460 IonMonkey: Assertion failure: interval->start() < pos && pos < interval->end() on ARM
715465 Extraneous reportError in preferences/advanced.js
715471 use fallible allocation for potentially large buffers in nsTextFrameThebes.cpp
715474 Successive zombie compartments with add-on "Screengrab (fix version)" 0.96.3c
715481 IonMonkey: Respect ION_DISABLED_SCRIPT in CanEnterAtBranch().
666500 add two subdomains for .CL (Chile) at request of NIC
557520 Embedded blocks should serve as bidi separators
715498 Bring back the "compile only" option for the shell
715501 GCLI should be built with the latest version of dryice
707313 gcWeakMapList can become circular
715507 GlobalHistory is accessing Gecko on the wrong thread
715511 IonMonkey: type based fast paths for GETPROP and SETPROP
707321 Intermittent browser_581593.js | an unexpected uncaught JS exception reported through window.onerror…
718634 Move CanSkip* to nsCycleCollectionParticipant
715518 WASD controls don't work in 3D view if typeaheadfind is active
559878 browser.urlbar.autoFill replaces typed characters in awesomebar with tab match URL characters
715528 Drop old bits about cross compiling from ppc to x86 and default OS X for ppc.
699155 Tabs list ordering
715543 Fix the debugger after the latest merge from fx-team
723746 regression: XUL Fennec uses non-tablet layout on ICS tablets
715555 Fix "unusued" spelling
715561 Startup crash with some extensions
674603 Text scaled, rotated 90 degrees and with text-anchor="middle" does not render correctly
709086 Don't use JS_GetParent in mozJSSubScriptLoader::LoadSubScript
715576 libalerts_s.dylib incorrectly links the static version of spidermonkey (in static-js configuration)
723772 regression: Panning in XUL fennec does not start until finger is removed from screen.
715582 Send quit-application in browser/components/privatebrowsing/test/unit
699199 Upgrade path from XUL to native fennec
715586 checksums.py should generate sha1 and md5 checksums
707403 When opening a tab in background, zombie compartment is created by Scriptish/Greasemonkey with some …
622232 DNS prefetches continue after a tab is closed
674647 Switch the OS X debug builds to 10.6
707423 IonMonkey: compile global scripts
723808 disallow inheriting of system principal in type=content docshells
699233 Misleading safe-mode UI misleads users during troubleshooting
715618 SharedLibrary operator= doesn't handle self assignment properly
707436 nsSetSmartSizeEvent can cause a lot of IO on the main thread
707439 Flash plugin wrong location on zoom & pan
715634 Cleanup XPCJSContextStack
715645 add makefile vars to disable Makefile regeneration rules
715647 I want to be able to remove nodes from the Tilt view
707460 Fix WebGL framebuffer statuses and errors
715662 browser-only methodjit crash (triggered by CSS transform tests)
723861 xpidllex.py and xpidlyacc.py are missing in Gecko10.0 for both Win & Mac
715672 Fix typo in ipc_message_utils.h
715673 Hande browser-lastwindow-close events
715678 Fix indentation in gonk/nsWindow.cpp
715679 Handle more than one window correctly
715682 "Assertion failure: !isIndex(&dummy),"
699300 Second external URL request does not open page
674725 WebSMS (or Messaging+)
674726 WebTelephony
691118 "ASSERTION: aPrevFrame must be the last continuation in its chain!"
715700 localStorage gets out of sync in Private Mode
576439 background on navigation toolbar if tabs on top even if hidden
715704 Add a quartz implementation of mark_dirty_rectangle
715710 [New Tab Page] Black bars behind titles should be lowered in opacity from 80% to 50%.
715718 [Skia] Unitialized variable 'margin' in SkDraw.cpp
711841 Add VoidString() or NullString() or NullDOMString()
715720 [Azure] Support DrawTarget in CanvasLayerOGL
715730 Flash app restarts after clicking a selection when click to play is turned on
715737 IonMonkey: Queueing instructions for LSRA is extremely expensive.
715739 document.write from inside a wyciwyg document adds to the cache stream
700922 Cursors in Favicons.java are not closed
695461 Download notifications
715756 Workers: Enable TI and allow JIT hardening to be disabled
707567 prepend http:// to URL copy selection only if (at least) full hostname is selected
707570 [SeaMonkey] "browser_bug435325.js:15 - ReferenceError: gPrefService is not defined"
715766 IonMonkey: Track Bailout rate and provide localization data in debug builds.
715769 Kill unused enums nsWidgetType and nsLanguageSpecificTransformType
715770 Kill nsRecyclingAllocator
715773 B2G SMS: Package dom_sms.xpt and set temporary permission prefs
715783 delay load for comdlg32 and winspool
715791 Preprocessor.py doesn't preserve line numbers when preprocessing Java
715800 Ignore all directories start with obj* in .gitignore
699418 Implement about:config in html
674843 TM: Assertion failure: (ptrBits & 0x7) == 0 or Crash [@ js::gc::ArenaHeader::allocated]
710491 Remove NS_SPECIALIZE_TEMPLATE from nsAutoRef documentation
715817 rm SRC_EXTENDED
715819 __defineGetter__ and __defineSetter__ can mutate non-configurable properties
715821 Don't have __define[GS]etter__ use CheckRedeclaration handle conflicts
715822 OGL CleanupResources should cleanup Texture resources too
707643 100% CPU usage and unresponsive script dialog pops up during page loading - www.eurogamer.net
715836 android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view h…
707650 Remove extra slash character from web console test uris
617539 get rid of _MOZILLA_2_0_BRANCH interfaces on trunk after we branch
707654 embeds relation on root accessible can return not content document
713228 SQLiteDatabaseCorruptException: database disk image is malformed: PRAGMA synchronous=1;
715852 JS Test Failure on ecma_5/Object/proto-property-change-writability-set.js ( Assertion failure: shape…
724045 createMobileBookmarksFolder doesn't set title or parent
707665 Save as PDF option should be disabled for about:home and any XUL documents
650322 Remove 'ac_add_options --disable-installer'
625849 Drop the prefer_gl in the WebGL mochitest on windows
642136 Debugger access to closure environments
711866 Crash when multiple source tag are loading a MP4 file and close the window.
707678 DryIce destDir feature not working
715872 Change the order of -framework options when linking XUL so that it works on 10.6 -> 10.5 builds
707682 java.lang.NullPointerException @ Tabs.isSelectedTab(Tabs.java:117)
691299 Crash at js::RegExp::executeInternal
650345 Implement minimal UI for Find in the Source Editor
715882 Tooltip(title attibute of the element) pops up even if the element has been removed.
715883 Remove JSRuntime::gcEmptyArenaPoolLifespan
715885 Crash in -[ChildView draggedImage:endedAt:operation:] @ PrepareAndDispatch while dragging, in 32-bit…
715887 Rename "Properties" to "Computed" in the Style sidebar
715892 In the Style Editor, remove the stylesheet filter
715894 Only draw the dirty rect when gralloc is in use
683127 New custom ELF linker
699513 Advertise Telemetry opt-in on mobile
715907 crash in jsd_NewValue @ JSCompartment::wrap with Firebug
700951 Back button "stack" is inconsistent when selecting the URL bar
715916 Crash [@ mozilla::gl::GLContext::UploadSurfaceToTexture ][@ XUL@0xf6ea2a ]
707732 Misc improvements on Android DB commands
715925 Options inside optgroup should show up as indented in select helper popup
715930 Use stdc++compat.cpp on OS X too
718703 Sync crashes from Pair a Device link in sync settings
707749 I need to click on the bookmarklet twice to make it work. If document.write is included in the bookm…
715943 StackFrame marking should not skip its JSFunction
715947 add telemetry for number of setTimeouts during an nsITimer run
715952 glxtest incorrectly creates the backing pixmap and causes X errors
724145 telemetry for search hijacking
617651 turn off optimizing surfaces in the multipart/x-mixed-replace case
429241 \x... and \u... in RegExp parsed wrong if not followed by enough hex digits
485237 Need to treat popups consistently
724161 simplify drag&drop checks for javascript:/data: URIs
683205 Create reftests for RLE8 BMPs
675015 Suppress synthetic mouse events due to scrolling until the scroll is complete
702330 Revert to drawing Flash plugin with a SurfaceView
715999 removeChild(): unexpected title tooltip after removing SVG element at mouse position
716004 Traverse nsXBLDocumentInfo less often
707814 Awesomebar autocomplete box appears in the wrong place
716013 "Assertion failure: static_cast(thing)->isMarked(),"
486643 deprecate sharp variables
724215 java.lang.NullPointerException: at org.mozilla.gecko.GeckoEvent.addMotionPoint(GeckoEvent.java)
716027 SetReservedSlot in jsfriendapi.h is missing a writer barrier
716031 Intermittent chrome://mochitests/content/chrome/editor/libeditor/base/tests/test_selection_move_comm…
716032 Fix false is not a good pointer warning
716033 Move write barriers from jsapi.h to jsfriendapi.h
707844 IonMonkey: try switching bailouts from three instructions to one or two
675078 rm JSThreadData and JSThread
707848 [Azure] Implement paths in Cairo backend
232716 [xft] need to add 'Uncode' font(s) to a fontconfig search pattern
707854 IonMonkey: Implement ICs for JSOP_GETPROP
707855 [fennec] [font inflation] mobile twitter fonts too large on latest nightly fennec mobile
691478 JavaScript strict warning: resource:///modules/HUDService.jsm, line 5012: reference to undefined pro…
699682 "Assertion failure: length != 0,"
716068 de-OptimizeSpanDeps
720092 java.lang.IndexOutOfBoundsException: getChars (0 ... 88168) ends beyond length 0
691505 ensure Graphite uses infallible malloc to give well-defined OOM behavior
707893 Add a (temporary) global pref to ignore X-Frame-Options
716089 Crash on startup: malformed query in local DB history query
699706 Scroll open tab into view when the tab list is opened
486716 Darwin/X11 - No certs, libnssckbi.dylib fails to load
585030 l10n review for inspector
699725 crash nsEventStateManager::FillInEventFromGestureDown
716112 Add an optional message argument to MOZ_ASSERT
699731 Remove PR_INT64_MAX / PR_UINT64_MAX from non-nsprpub source
716119 Miscompilation of conditional expressions
707929 java.lang.NullPointerException @ ZipFile.getInputStream(ZipFile.java:256)
716127 Always sharing Geolocation fails to determine location on every other reload
717371 Don't use nsINode::GetChildAt in PresShell::GoToAnchor
716006 Don't traverse NodeInfoManager so much
716139 Don't try to generate js/src/analysis-tests/Makefile, since the directory no longer exists
716145 test_eventctors.html calls SimleTest.finish needlessly
716146 Telemetry: close disk cache output stream
707956 Restore original zoom scale on double rotation?
716149 IonMonkey: Assertion failure: *from != *to in GRA
703721 (ObjShrink) Move arguments object private data to a reserved slot
721079 Calling preventDefault on the first touchmove event prevents panning, but not quickly enough
716167 Add a release-mode assertion that XPConnect is never used off the main thread
454024 "ftp:///" (no hostname) gives an empty list of files instead of an error
699786 Cancel pending favicon requests for tabs that changed location
716176 GC: missing barriers in BaseShape::operator=
699793 Clear favicon urls database when history is cleared
568724 Debugger needs user interface sketches
675221 Remove XPCOM proxies
673689 introduce namespace role
691609 Floating scrollbars draw under border/background
609710 TestStartupCache.cpp has build warnings for deprecated conversion from string constant to 'char*'
708015 support both xul and android UI at the same time
208309 there is no Bidi/Joining algorithm on Arabic/Persian texts in MathML
716215 nsHTMLEditor::IsEmptyNodeImpl checks if the parent is a form widget instead of the child
708031 refactor the ifdefs in nsStackWalk.cpp
716226 CSSKeyframeRule created by CSSKeyframesRule.insertRule has invalid value for parentRule/parentStyleS…
708036 debug assert abort in nsLayoutUtils::InflationMinFontSizeFor() when playing fullscreen video test
716229 Plain text in WWW pages now appears to be double-spaced? (line height is double, too tall, newlines…
716236 Cleanup GuardObjects.h
716238 ThunderbirdTry: "reftest/tests/content/media/test/crashtests/495794-1.html | load failed: timed out …
273874 Firefox migrator for new profiles
708051 Avoid IPC x ipc confusion on case insensitive filesystems
568806 Clean up "media events"
724455 conformance/textures/texture-mips.html and conformance/textures/texture-npot.html fail on 10.7
708072 Test page for stretchy and large operators
617961 Expose the device ids on OS X in about:support
708075 the shaped-word caches should be flushed on memory-pressure notification
593396 implement typed arrays BYTES_PER_ELEMENT
683510 GCLI needs a 'console' command
716286 Fixup how we handle ScaledFont interaction between skia and mac
716289 crash in nsCacheService::SearchCacheDevices
716293 IO on the main thread caused by nsDiskCacheOutputStream::Close()
699917 Crash (Java OOM) on ajax site
699918 Add a Profiler XPCOM Module
708114 Disable Android StrictMode for release and beta builds
429592 catch process hangs
593433 Inspector leaks on shutdown if left open
708125 OGL Layers thrashes current context in UpdateSurface and RenderLayer
695170 History, visited link styles
699937 content overpan gets stuck over panning
699940 mouse events have the wrong x,y when zoomed isn't 1:1
716332 For double-buffered windows, temporary fbo used to determine mFBOTextureTarget isn't deleted
702386 Support setting persistence to -1 for doorhangers
708144 After loading a new page, the WebArea is no longer accessible
716338 Makes content/html/content/src warning free
708151 Handling of deleted records
708154 Add (hacky) non-GL compositor backend to gonk
708159 Avoid unnecessary work done by multi-reporters nsMemoryReporterManager::GetExplicit
618051 Enable IDN for .si
716357 Fix license header in FilteringWrapper.cpp
708176 [WebAPI] Allow privileged pages to access cross-origin properties in child iframes
720142 Use nsIntRect for table damage
708185 Remove homepage preference
679183 Handle DOM mutations correctly as far as selection is concerned
716380 socket transport n != 0 assertion
708191 Don't draw when the screen is off on gonk
609890 window.console API messages from before the Web Console is opened don't show
700006 [layers] about:home show dead space
708200 Do not create timer to fire geckoLoaded
716397 [Linux] "Warning: package error or possible missing or unnecessary file: bin/libmozglue.so (package-…
716402 first in a row of identical letters positioned 1 px too far apart
716408 Minor cleanup in table code
716415 [Skia] Update skia to svn revision 2980
716417 Crash in nsINodeInfo::NodeInfoManager() called from LookupMediaElementURITable
711958 Add a 'length' property to DOMSVGStringList
716424 remove unused string kDocumentIconPath
702403 Kinetic scrolling shouldn't do a fling animation when stopped
716456 "ASSERTION: aRoot not an ancestor of |this|?"
716469 IonMonkey: Port ICs to ARM
708280 delay checking for update
708283 NullPointerException in VideoPlayer on launch
667324 "ABORT: We expect aDirtyRect to be non-null" with in
667329 Add CSP support for websockets
708303 Use pinReg/unpinReg more in write barriers
708307 Decouple tile size from texture size
716504 IonMonkey: LMulI should not bailout if the result is positive zero
700124 Attempting to use JNI in child process [@ mozilla::AndroidBridge::EnsureJNIThread]
716512 gcparam broken: Assertion failure: value >= rt->gcBytes, at jsapi.cpp:2900
708322 NoteJSChild shouldn't add children if the non-CCKind node is non-gray
716518 Add beforeTraverse and purpleCleanUp phases to CC
708331 Need additional columns in browser content provider
593645 use popup.triggerNode instead of document.popupNode for tab context menu
716527 nsSVGForeignObjectFrame::PaintSVG may dereference null aDirtyRect
700153 opening page in new tab opens it in background, but url bar contents in foreground
667387 nshttppipeline::taketransport
716541 Do not fail build on -Wuninitialized when treating warnings as errors
716549 Flush layout on mousemove events so that they get delivered to the right place
714711 A few unused local variables in PanZoomController.onScaleEnd
659213 status bar text is drawn with grayscale anti-aliasing
697906 IonMonkey: MoveResolver does not handle hairy cycles well
708377 Don't use NonstandardTo{Ui,I}nt32 for typed arrays
716570 Rename blob URI scheme from "moz-filedata" to "blob" per spec
708379 Haptic buzz when tapping on clickable elements
716576 nsCacheService closes its databases too late
708394 Avoid LayoutInflater in constructors
716589 crash nsDocAccessible::GetNativeWindow
716590 WalkStackMain64 shouldn't skip frames unless it's walking the thread that called NS_StackWalk
716593 test_bug596001.html calls SimpleTest.finish needlessly
716594 OOM crash in nsNSSCertificate::Read
716595 Pressing back button in select form helper popup causes the first option to be selected
700221 Fix for bug 495798 makes us not drop native theming for any style changes other than background colo…
708415 Review SPDY protocol patches
716619 Simplify GC probes
708431 Video controls fail to initialize if an extension implementing nsIContentPolicy is present (e.g. Adb…
716624 IonMonkey: Assertion failure: unexpected type, at ../ion/LIR.h:568
716629 Mark deleted JSFunction methods as private
716630 Kill editor's warnings
719731 Get rid of window mediator's getMostRecentBrowserWindow across Tilt codebase
716090 IonMonkey: Invalidate inactive IonScripts
716638 mozalloc_handle_oom should propogate the failed allocation size into crash reports
716639 Add a constructor for gfxQuartzSurface that takes a gfxIntSize
724284 use after free in nsXBLDocumentInfo::ReadPrototypeBindings
708464 Create click to play UI for fennec native
618353 window frame is one pixel too wide on win 7
683891 Stop exporting symbols that are THEBES_API from libxul
716663 "checking for gcc PR49911... mozilla/configure: 9506: test: no: unexpected operator"
716673 PanZoomController needs an in-depth review/clean up
708485 Add Special Folders with Sync guids to Bookmarks Store
708486 IonMonkey: Add guards into the code generator for IDIV on ARM
249735 F6 goes to the first focusable element instead of the address bar (does not focus on location bar)
576903 Intermittent "assertion count 1 is more than expected 0" in crashtests/284852.html from "ASSERTION: …
700298 BatteryManager should initialize mScriptContext and mOwner
716688 Add Assamese to shipped-locales on aurora and beta
716692 browser.js needs to stop observing browser.tabs.onTop when the browser window is closed
716699 Add FAIL_ON_WARNINGS in some SVG/SMIL directories
528284 Intermittent failure in js1_5/extensions/regress-371636.js | Numeric sort performance Expected value…
716702 jsopcode.h:661:5: warning: C++ style comments are not allowed in ISO C90
708519 Repair, move, and pref off the frame rate meter
716713 "Assertion failure: ss->top >= 2," or "Assertion failure: top != 0," or "Assertion failure: newtop vindex,"
619273 Move the selection state bit from frames to content nodes
709391 Implement short-term in-Fennec shipping solution
717584 FAIL_ON_WARNINGS in content/canvas/src
652050 Some non-code change on 2011-04-21 caused four SVG reftests to fail on Android, due to "intl.accept_…
275223 Page Info columns should be sortable
709400 Would like to to override nsIInlineSpellChecker with javascript but [noscript] methods are blocking …
701210 nsTArray::SizeOf() should use malloc_usable_size
717596 GCLI: automatically added '}' is not displayed in this one place
717598 Backout changeset 05f3cb:13e49 missing reviewer from comment
709423 IonMonkey: Extend callWithABI to work with float arguments
717622 GCLI: typing in a for loop causes an exception
709432 BrowserProvider overwrites provided GUIDs
701245 JavaScript Error: "browser is null" {file: "chrome://browser/content/browser.js" line: 1091}
136002 inconsistant margins (no right margin) when viewing straight image (jpg)
701259 crashes on videos when scaling to large width/height
701260 Deny requests for DOM full-screen when windowed plugins are present in the entire doc tree
701269 WebGL / Canvas displaying uninitialized video memory.
701284 Continous 'nsAppShell::ProcessNextNativeEvent' messges dumped to logcat
701285 No favicons display after loading pages
332648 Expose js::AutoGCRooter and its subclasses via a public header
701292 clicks are transmitted when panning
725869 Set the plugin hang timeout back to 45s
709486 "Warning: Ignoring obsolete chrome registration modifier 'xpcnativewrappers=no'" message in error co…
717683 get rid of nsIAccessibleDocument uses
717689 unneeded nsCOMPtrs to nsAccessibles
603008 Support multitouch on Android
455553 New Tab Page feature
709509 Remove manual refcounting and QIing from nsBulletFrame::DidSetStyleContext
684938 Proxy nsXPCWrappedJS::Release to the main thread
717711 telemetry for time spent in between CCs
717713 Add -Qunused-arguments to Clang compiler flags
709533 Remove unused FindFirstString in mozHunspell.cpp
578462 code cleanup: fix typos, remove unused variables, and a bit more
660387 Add co.ca TLD to PSL
717733 Fix int64 types usage in js/xpconnect
701351 Vertical/Horizontal scrollbars missing with new compositor
619433 [meta] TypeInference browser integration
717739 turn off non-native sync
627628 be smarter about dispatching starved paints
717753 [SeaMonkey] mochitest-a11y: test_focus_browserui.xul needs to support non-Firefox applications too
709562 nsAutoDialWin does not need to load rasapi32/rasdlg dynamically
701371 Move memory/mozutils somewhere else
709566 B2G SMS: PDU parser and formatter
709567 B2G SMS: DOM to RIL plumbing in ril_worker.js
701376 show search engine(s) when there are no/few awesomebar results
709569 Create some tool to generate helper code for webidl dictionary value reading
717762 Proliferate js_memcpy and PodCopy
701380 Implement a native about:home (start page)
717769 Fix

New in Firefox 12.0b3 Beta (Mar 29, 2012)

New in Firefox 12.0b2 Beta (Mar 22, 2012)

New in Firefox 11.0 Final (Mar 14, 2012)

New in Firefox 11.0b5 Beta (Mar 1, 2012)

New in Firefox 10.0.2 Final (Feb 17, 2012)

New in Firefox 10.0.1 Final (Feb 10, 2012)

New in Firefox 12.0a2 Aurora (Feb 4, 2012)

New in Firefox 10.0b1 Beta (Dec 23, 2011)

New in Firefox 8.0.1 Final (Nov 22, 2011)

New in Firefox 8.0 Final (Nov 16, 2011)

New in Firefox 10.0a2 Aurora (Nov 12, 2011)

New in Firefox 9.0b1 Beta (Nov 12, 2011)

New in Firefox 8.0b1 Beta (Sep 30, 2011)

New in Firefox 7.0.1 Final (Sep 30, 2011)

New in Firefox 7.0 Final (Sep 27, 2011)

New in Firefox 6.0.2 Final (Sep 7, 2011)

New in Firefox 6.0.1 Final (Aug 31, 2011)

New in Firefox 7.0b1 Beta (Aug 19, 2011)

New in Firefox 6.0 Final (Aug 17, 2011)

New in Firefox 6.0b2 Beta (Jul 16, 2011)

New in Firefox 6.0b1 Beta (Jul 9, 2011)

New in Firefox 7.0a2 Aurora (Jul 8, 2011)

New in Firefox 3.6.18 (Jun 22, 2011)

New in Firefox 5.0 Final (Jun 22, 2011)

New in Firefox 5.0b7 RC (Jun 16, 2011)

New in Firefox 6.0 Alpha 2 (May 28, 2011)

New in Firefox 5.0 Beta (May 21, 2011)

New in Firefox 3.6.17 (Apr 29, 2011)

New in Firefox 4.0.1 (Apr 29, 2011)

New in Firefox 3.6.16 (Mar 23, 2011)

New in Firefox 4.0 (Mar 23, 2011)

This release features JavaScript execution speeds up to six times faster than the previous version, new capabilities for Web Developers and Add-on Developers such as hardware accelerated graphics and HTML5 technologies, and a completely revised user interface.
Firefox 4 is available in over 80 languages
Uses JägerMonkey, a new, faster JavaScript engine that is up to six times faster than Firefox 3.6
Support for the Do Not Track ("DNT") header that allows users to opt-out of behavioural advertising
Firefox Sync is included by default, allowing you to securely synchronize between multiple computers and mobile devices
Certain graphics rendering operations are now hardware-accelerated using Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7
Direct2D Hardware Acceleration is now on by default for Windows 7 users
WebGL is enabled on all platforms that have a capable graphics card with updated drivers
Native support for the HD HTML5 WebM video format, hardware accelerated where available
Firefox button has a new look for Windows Vista and Windows 7 users
Tabs are now on top by default
You can search for and switch to already open tabs in the Smart Location Bar
The stop and reload buttons have been merged into a single button
The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like)
Crash protection when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins
You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu
The default homepage design has been refreshed
Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
Per-compartment garbage collection is now enabled, reducing work done during complex animations
Additional polish for the Firefox Add-ons Manager
Improved web typography using OpenType with support for ligatures, kerning and font variants
Web developers can animate content using CSS Transitions
Responsiveness and scrolling improvements from the new retained layers layout system
HTML5 Forms API makes web based forms easier to implement and validate
Support for the new proposed Audio Data API
Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
A new feature called Panorama gives users a visual overview of all open tabs, allowing them to be sorted and grouped
An experimental API is included to provide more efficient Javascript animations
Firefox now supports the HTML5 video "buffered" property
Changes to how XPCOM components are registered in order to help startup time and process separation
New Addons Manager and extension management API (UI will be changed before final release)
Significant API improvements are available for JS-ctypes, a foreign function interface for extensions
CSS Transitions are partially supported
More responsive page rendering using lazy frame construction
Link history lookup is done asynchronously to provide better responsiveness during pageload
CSS :visited selectors have been changed to block websites from being able to check a user's browsing history
New HTML5 parser
Support for more HTML5 form controls
Web authors can now get touch events from Firefox users on Windows 7 machines
A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently

New in Firefox 4.0 RC 2 (Mar 19, 2011)

Blacklisted a few invalid HTTPS certificates
Updated localizations for 29 locales
Added Vietnamese localization, bringing the total languages available in Firefox 4 to 83
Support for the proposed Do Not Track ("DNT") header
Connection status messages are now shown in a small overlay
WebGL is enabled on all platforms, but, like for other hardware acceleration features, many buggy drivers or driver versions are blocked
The default homepage design has been refreshed
Firefox no longer switches into offline mode automatically
Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
Per-compartment garbage collection is now enabled, reducing work done during complex animations
The Firefox Sync setup experience has been greatly improved across desktop and mobile devices
Additional polish for the Firefox Add-ons Manager
Uses JägerMonkey, a new, faster JavaScript engine
Certain rendering operations are now hardware-accelerated using Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7, and OpenGL on Mac OS X
Improved web typography using OpenType with support for ligatures, kerning and font variants
HTML5 Forms API makes web based forms easier to implement and validate
Support for the new proposed Audio Data API
Direct2D Hardware Acceleration is now on by default for Windows 7 users
Firefox button has a new look for Windows Vista and Windows 7 users
Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
Firefox Sync is now included by default
A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped
An experimental API is included to provide more efficient Javascript animations
Firefox now supports the HTML5 video "buffered" property
Tabs are now on top by default on Windows, Mac OS X, and Linux
You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu
Web developers can animate content using CSS Transitions
Responsiveness and scrolling improvements from the new retained layers layout system
JavaScript speed improvements due to engine optimizations
Changes to how XPCOM components are registered in order to help startup time and process separation
You can search for and switch to already open tabs in the Smart Location Bar
New Addons Manager and extension management API (UI will be changed before final release)
Significant API improvements are available for JS-ctypes, a foreign function interface for extensions
The stop and reload buttons have been merged into a single button on Windows, Mac OS X, and Linux
The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like)
Crash protection for Windows, Linux, and Mac OS X when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins
CSS Transitions are partially supported
Full WebGL support is included
Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently
Native support for the HD HTML5 WebM video format
Web developers can update the URL field without reloading the page using HTML History APIs
More responsive page rendering using lazy frame construction
Link history lookup is done asynchronously to provide better responsiveness during pageload
CSS :visited selectors have been changed to block websites from being able to check a user's browsing history
New HTML5 parser
Support for more HTML5 form controls
Web authors can now get touch events from Firefox users on Windows 7 machines
A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently

New in Firefox 4.0 RC 1 (Mar 10, 2011)

General stability, performance, and compatibility improvements.
632833 - Crash [@ nsGlobalWindow::LeaveModalState(nsIDOMWindow*) ]
626691 - "Log In To My T-Mobile" flash text is mispositioned, when loading "My T-Mobile" page in background t…
635397 - when tabbar and menubar have unified appearance, tabbar should be just as draggable as menubar
635400 - crash [@ nsBuiltinDecoder::GetBuffered]
635401 - Segfault when checking name of graphics driver vendor
634380 - Problem with drop down menus on Nike and also on other sites
635405 - Zooming windowless plugin frame can cause it to "bleed" outside bounds
628048 - hovered highlight on menu item sticks around too long after moving to a different menu item
636945 - add downcasting for nsRootAccessible
620206 - nsFrameMessageManager::ReceiveMessage returns non-nsresult values
636692 - Remove the Hotmail-specific hack that forces the old parser for document.open()
513616 - [meta] nanojit: clean up register allocator
635417 - Regular expression bug (breaks splinter patch review)
635418 - TabShow & TabHide should cause saveStateDelayed
629167 - FFT algorithm runs 5X faster with Tracemonkey-only than with Jaeger and Trace Monkeys working togeth…
635420 - Clicking on content within Normal tab of Composer and stops switching to other tabs
623136 - speed up font loading on android
633890 - Assertion failure: prop == (JSProperty*) shape
637987 - IPDL protocols used in unit tests are always built, even without --enable-ipdl-tests
633892 - Blacklist NVIDIA NVS 3100M on driver 8.17.12.5896
635943 - Check Items.arrange() calls to make sure tab bounds are correctly calculated
636968 - Startup crash [@ InitDwriteBG ] in virtual environments
619565 - "Assertion failure: scopeChain_ == calleeValue().toObject().getParent()"
633390 - Crop long link URLs in the middle instead of at the end (as the location bar hover link did)
636465 - misspelled words in the subject line get underlined despite disabled "Spell Check As You Type" in a …
635442 - Crash [@ nsSVGComponentTransferFunctionElement::DidAnimateNumberList]
630835 - Transition paint wrong fragments at the end of transition for 1-2 seconds.
536630 - TM: awful LIR generated for bitwise-and.js (and everything else)
635451 - Firefox changes font mid-line on some numerals
632893 - Remove useless Cc/Ci/Cr/Cu/Components.*/Services.jsm from Firefox tests
635966 - elfhack fails with llvm LTO
635968 - JM: Crash on Google Spreadsheet
387138 - immediately after instantiation (cut/paste or subscribe), livemark looks like a regular folder in so…
632587 - implement getSupportedExtensions and isContextLost
632901 - TM: crash when assigning to function.arguments
635462 - "/tests/dom/tests/mochitest/ajax/prototype/test_Prototype.html or /tests/dom/tests/mochitest/bugs/te…
635465 - JavaScript menu is not working on sports.ru
635980 - Frequent harmless ASSERTION Nv3DVStreaming Nv3DVControl failed!
463950 - When feed is refreshed in Thunderbird, in feed starts playing
636495 - Make enabling profilers actually --enable-profiling
626768 - Startup crash [@ mozalloc_abort(char const* const) | mozcrt19.dll@0x1327f | nsCycleCollectorGCHookRu…
635475 - nsIdleServiceDaily can cause pointer corruption
562262 - fix license in a11y files
626617 - Remove Termiadur search plug-in on major update to 4.0
637019 - regression at www.staples.com - Sorting feature doesn't work (Sort by A-Z; Z-A; etc)
631388 - Investigate not centering plugin images in their frame if the frame/image sizes mismatch
624733 - Add .masr (Egypt) to IDN TLD whitelist
634974 - JavaScript strict warning: chrome://browser/content/tabview.js, line 3274: anonymous function does n…
629857 - Gray bar is added after repainting layer
636002 - better messages about attrib index validation
627729 - Selectively use the old HTML parser for Hotmail to work around repeated reloading
636008 - [Maemo6] Fennec crashes on startup, with Xlib error.
632423 - Text poorly rendered with hardware acceleration off (most noticeable with white text)
632941 - statuspanel's minimum width should be an em value and max width should be a percentage value
629358 - Baum Retec AG Cobra screen reader popup compatibility issue
637040 - iframe embedding youtube not displaying in os x
637032 - Repeated Console messages in the Web Console not showing number
609396 - Some Frames are rendered inconsistently after restart.
602558 - MSVC10 fails to compile with Google OTS source
621686 - Enable IDN for .ua
637559 - Add logging to Android Bridge
634132 - The page flickers/flashes black when scrolling the page while a flash video (on BBC, Engadget, and p…
635005 - new RegExp(undefined) should work like new RegExp("")
637901 - Video in youtube goes white
635008 - browser hangs every time on the "categorize your question" page on yahoo answers and needs to be kil…
386690 - Negative width attribute and percentage height on causes "ASSERTION: reflow stat…
635014 - Don't draw the checkerboard behind undefined content in "sync scrolling mode"
588426 - Restoring multiple solely hidden tabs (after crash) breaks session restore
621707 - Add gob.ec to PSL
621710 - Add bv.nl to PSL
631491 - toolbar's iconsize attribute is not updated correctly after switching themes
603798 - our tabs look great on XP but don't fit as well with Windows 7 and aero
623768 - Pressing Backspace in Panorama causes last focused tab to navigate backwards
636219 - JM: Interpreter's useMethodJIT flag needs to be reset when entering a new function
638106 - CKEditor document should be editable
607900 - [startup-notification] Two windows started when Firefox launched for the first times
634906 - Allow CORS from nsXmlHttpRequest when script is loaded from file
636613 - Let WebGL mochitest run on Windows XP
638116 - use different background gradient colors in split menu buttons in Firefox Button
634534 - Firefox 4 crash Silverlight video [@ mozalloc_abort(char const* const) | mozcrt19.dll@0x1327f | mozi…
601768 - Ensure it's safe to hand a function to a sandbox
635051 - revert experienced_first_use to experienced_first_run
634542 - Spike in crashes [@ call_trace ] among users with Firebug installed + [@ JSStackFrame::callObj() ]
591537 - Freeze UA build id for Firefox branded builds
635059 - Update WebGL test suite to version 1.0.0 from khronos.org
636086 - build bustage when building with --disable-pango
637385 - TM: Assertion failure: obj == globalObj, at ../jstracer.cpp:15253
636088 - Blocked LSP: Microsoft Proxy Client / Microsoft Firewall Client Service Provider
635068 - WebGL test array-unit-tests.html fails
636093 - "ABORT: Shadow layers can't be destroyed during txns!: '!HasShadow() || !BasicManager()->InTransacti…
636609 - Remove DEBUG_GL_ERROR_CHECK
633462 - Talos turns orange on "###!!! [Child][RPCChannel] Error: Channel closing: too late to send/recv, mes…
628938 - Treewalker not working properly in Mozilla Treewalker Demo
630306 - "jsobj.h:1239: warning: inline function 'JSCompartment* JSObject::getCompartment() const' used but n…
636877 - Improve android restarts
635768 - pages print improperly
636114 - Crash [@ PluginBackgroundSink::~PluginBackgroundSink() ]
638414 - Missing toString() function on Array.prototype - TypeError: Array.prototype.toString called on incom…
633465 - Turn off bug 591836 workaround on Win64
635608 - Clean up sizemode=normal & disablechrome styling for aero glass
636637 - "e is not defined" error while trying to log "Error while loading thumbnail"
634590 - Unqualified function invocation doesn't use the global object the property was gotten from as |this|
634593 - Assertion failure: proto->isNative(), at jsobjinlines.h:917
636131 - iBus freezes when it retrieves surrounding text and if the caret is at end of line (IA__gtk_im_conte…
636143 - Full screen tab bar doesn't drop down after minimize and top of content is cut off.
606960 - crash [@ js::Interpret(JSContext*, JSStackFrame*, unsigned int, JSInterpMode) ]
621411 - Hardware acceleration in Firefox/SeaMonkey causes Oracle VirtualBox 3.2/4.0 to crash
633074 - Zoom in animation is not shown for tabs deep within stacks
637683 - crash [@ memcpy | NS_CopySegmentToBuffer(nsIInputStream*, void*, char const*, unsigned int, unsigned…
626421 - Non-clickable area on top of each tab in Windows XP (tabs in titlebar)
636666 - paste option doesn't appear in context menu for text boxes in content on android
619773 - WebGL: Crash with blue screen : "NMI: Parity Check / Memory Parity Error" with ATI Mobility FireGL V…
637184 - Missing newline at end of file in MacIOSurfaceImageOGL.h
631553 - crash [@ PL_DHashTableOperate | nsFrameScriptExecutor::LoadFrameScriptInternal]
627464 - Annotate crash reports about gfx features in use
636169 - Web Console notifications needed for customization via Addons
629514 - Use public domain headers for our tests
627979 - [clang] "cannot compile this __asm__ yet" in xptcinvoke_x86_64_unix
615693 - Improve the inactive window appearance of tabs-on-top
623405 - svg text rotation reftest failures on WinXP: anim-text-rotate-01.svg & dynamic-text-04.svg
636176 - Sync should not sync general.autoScroll
636689 - Rename the HTML5 parser pref in order to reset it for everyone who has flipped it during the beta cy…
635666 - WebGL crash [@mozilla::WebGLContext::CopyTexSubImage2D]
635155 - Get full JIT-tests coverage back
635156 - typos in test svg files.
624917 - undo close tab does not restore page with frameset
637206 - Random pauses while watching Hulu videos
524761 - Intermittent failure in test_resolveNullBookmarkTitles.js
634648 - re-enable tests disabled due to debug shell reftest assertion: !CompartmentHasLiveScripts(comp)
638218 - Asynchronous policy-uri fetching causes connection problems when using NTLM proxy
632612 - Minor improvements to js_DumpObject
620326 - Intermittent failure in /tests/content/media/test/test_playback.html | Test timed out.
633133 - Testing for named items in HTMLCollections using 'in' operator always returns false
635696 - restore focus after "Undo Close Group" of last group
612872 - HAL/Supernova needs more sophisticated window emulation
635195 - Assertion failure: !wp->setter, at jsdbgapi.cpp:781
615741 - too large canvases don't draw and are black
553278 - Video should decode into buffers allocated by layer backend we are targeting.
637401 - [regression] Console message nodes do not have unique IDs anymore
638276 - Update (and fix) nsTextEditorState.h documentation
635594 - Assertion failure: !tm->recorder, at jstracer.cpp:7131
414690 - match case checkbox and label not aligned vertically with find toolbar buttons
631119 - Dummy popup widgets created in content process can interrupt IME state
635728 - Favicon background must match group item background color
617297 - Fennec 4.0b3pre Crash Report [@ nsXPConnect::GetPrincipal] [@ nsScriptSecurityManager::doGetObjectPr…
609106 - Add plugin-container.exe to ShimInclusionList via installer
635733 - Weird transparency when dragging tabs out of groups
635737 - Zoom animation frame is rotated when we zoom out of a non-top stacked tab
637278 - Full CPU load as long as o2online.de is displayed with hardware acceleration disabled
637282 - Crash [@ mozalloc_abort(char const* const) | NS_DebugBreak_P | mozilla::plugins::PPluginInstance::Tr…
632379 - Can't select some bookmarks
594596 - Crash in [@ nsMenuPopupFrame::CreateWidgetForView(nsIView*) ]
613221 - TypeInference: make inference structures GC safe
636776 - Crash [@ nsSHEntry::GetParent(nsISHEntry**) ][@ @0x0 | nsSHEntry::GetParent(nsISHEntry**) ][@ nsDocS…
638318 - Page starting with lots of NUL chars is incorrectly sniffed as UTF-16BE (with HTML5 parser enabled)
635844 - Update pushState to latest spec. Again.
635252 - Autocomplete textbox gets corrupted after customizing toolbars
634942 - HelperApp launch is broken with GIO
621432 - Assertion failure: script->main code + script->length
636281 - crash [@ -[ChildView setMarkedText:selectedRange:]]
636795 - PROCESS-CRASH | test_index_messages_imap_online_to_offline.js (and others) crash after latest tracem…
633725 - docload_wnd.xul (and nsRootAcc_wnd.xul) tries to load about:robots which is Firefox specific (atm)
601988 - Translated C++ code is not as fast as it could be
637321 - Fix tests that try to use the 'telephone' input type instead of the 'tel' input type
634454 - The Find bar at the bottom of the page keeps going away
633741 - Assertion failure: !cx->isExceptionPending(), at ../jscntxtinlines.h:704
636817 - Video only plays on mouseOver
620434 - useless null check of result in nsXULTreeBuilder::ReplaceMatch
636820 - Test for bug 634590 fails with -a -m
635286 - ":not()" pseudo class in ":-moz-any()" selector doesn't work correctly
627096 - [Meta] Panorama BetaN
631194 - Overlay for connecting / waiting / loading status messages is no longer "small"
636655 - Creating large textnodes became slower since 1.9.2
635665 - nsPrefBranch::GetComplexValue code incorrect after e10s merge
476570 - need an message to console or in the page when src not found for video tag
577438 - Make NodeIterator and TreeWalker not use GetChildAt
586145 - JM: improve string concatenation speed in date-format-xparb.js
565667 - 'Tools' > 'Add-ons' only works when browser window is in the foreground
630180 - ###!!! ASSERTION: No parent accessible where we're not direct child of window: 'xpParentAcc', file .…
596901 - "ASSERTION: Attempting to nest call to BeginSecureKeyboardInput" when iframes fight over password-fi…
635814 - add shellName and shellVersion to nsSystemInfo
570279 - Tab+NavBar Connecting Curve Adjustments
629160 - Generating CASE_EXIT for some default cases in tableswitch when tracing
636828 - browser.js nsINavBookmarkObserver::onItemAdded incorrectly expects aURI when folder added
637200 - GET-request to www.youtube.com is removed from WebConsole
634745 - Fix ARM SIMD/NEON tests to work with LTO
637361 - REOPEN : SSL pages don't work when using a NTLM proxy
631733 - When idle the GC holds on to unused chunks indefinitely
630201 - Crash [@ nsTArray::Clear() ] with pre-Windows-RTM ver…
632763 - Block level links and dynamic HTML
633788 - "closing last tab" inconsistency between main browser window and panorama
604944 - new crash starting in 20101015 nightlies [@js_GetReservedSlot(JSContext*, JSObject*, unsigned long, …
613314 - Firefox/4.0b8pre crash in [@ nsWindow::IPCWindowProcHandler(unsigned int&, unsigned int&, long&) ] m…
636356 - WebGL crash [@mozilla::WebGLBuffer::ZeroDataIfElementArray]
626678 - Firefox becomes unresponsive when docking or undocking my laptop
636870 - Using webgl on optimus hardware causes instant crash
637004 - Crash [@ mozilla::plugins::PluginInstanceChild::EnsureCurrentBuffer() ]
523928 - Partner contact for McAffee
636364 - Followup fixes and tests in wake of global |this| binding change (shell failure on js1_8_5/regress/r…
636365 - Add separate GCTIMER interval for sweeping Shapes
637390 - Test interpreter only in jit-tests
73681 - RANGE:Child Nodes of Attr Nodes have a parentNode property set to null.
611795 - Repeated messages in the Web Console should be collapsed into one
633305 - about:memory should display memory reporters that live in the child process
637915 - nsJNIString is leaky with zero length strings.
634844 - Non-animated plugins constantly reupload image with accelerated layers and async rendering
636894 - Audio 'MozAudioAvailable' event timing behaving poorly
630693 - Web console's copying adds extra newline between groups.
635873 - Assertion failure: compartment == rt->gcCurrentCompartment
635362 - Assertion fails when closing group item
586212 - Don't carry out the command when clicking on a disabled splitmenu
631270 - Status panel gets in way / obscures a Find result at the bottom of the page
628049 - Improve the hover styling of split menus in the Firefox menu
636906 - GFX blacklisting not affecting WebGL?
632817 - Cannot filter search for NET events in the Web console
635892 - Invalid HTTP version triggers text/plain or text/xml rendering
635668 - The zoom in animation doesn't work for new tab by group "+" button or double click on group or empty…
636408 - When opening stack window the titles of the website are not visible
624636 - Allow reftests to set a "displayport" and "view transform"
596478 - Intermittent fail in layout/reftests/svg/image/img-dyn-1.html
556117 - Either breakage or missed fix in nsPNGDecoder.cpp in 1.9.0.19

New in Firefox 3.6.15 (Mar 5, 2011)

New in Firefox 3.6.14 (Mar 2, 2011)

New in Firefox 4.0 Beta 12 (Feb 26, 2011)

New in Firefox 4.0 Beta 11 (Feb 8, 2011)

New in Firefox 4.0 Beta 10 (Jan 26, 2011)

New in Firefox 4.0 Beta 9 (Jan 14, 2011)

New in Firefox 4.0 Beta 8 (Dec 21, 2010)

New in Firefox 4.0 Beta 7 (Dec 21, 2010)

New in Firefox 3.6.13 (Dec 10, 2010)

New in Firefox 3.6.12 (Oct 28, 2010)

New in Firefox 3.6.11 (Oct 20, 2010)

New in Firefox 3.5.13 (Sep 16, 2010)

New in Firefox 3.6.10 (Sep 16, 2010)

New in Firefox 4.0 Beta 6 (Sep 15, 2010)

New in Firefox 4.0 Beta 5 (Sep 8, 2010)

Changes:
Firefox 4 Beta 5 is available in 39 languages.
Support for the new proposed Audio Data API
Direct2D Hardware Acceleration is now on by default for Windows 7 users
Firefox button has a new look for Windows Vista and Windows 7 users
Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL.
As well as these features from previous Firefox 4 Betas:
Firefox Sync is now included by default.
A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped.
An experimental API is included to provide more efficient Javascript animations.
Firefox now supports the HTML5 video "buffered" property.
Tabs are now on top by default on Windows and OSX - Linux will be changing when the theme has been modified to support the change.
You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu.
Web developers can animate content using CSS Transitions.
Responsiveness and scrolling improvements from the new retained layers layout system.
JavaScript speed improvements due to engine optimizations.
Changes to how XPCOM components are registered in order to help startup time and process separation.
You can search for and switch to already open tabs in the Smart Location Bar.
New Addons Manager and extension management API (UI will be changed before final release).
Significant API improvements are available for JS-ctypes, a foreign function interface for extensions.
The stop and reload buttons have been merged into a single button on Windows, Mac and Linux.
The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like).
Crash protection for Windows, Linux, and Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins.
CSS Transitions are partially supported.
Full WebGL support is included but disabled by default at this time.
Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently.
Native support for the HD HTML5 WebM video format.
An experimental Direct2D rendering backend is available on Windows, turned off by default.
Web developers can use Websockets for a low complexity, low latency, bidirectional communications API.
Web developers can update the URL field without reloading the page using HTML History APIs.
More responsive page rendering using lazy frame construction.
Link history lookup is done asynchronously to provide better responsiveness during pageload.
CSS :visited selectors have been changed to block websites from being able to check a user's browsing history.
New HTML5 parser.
Support for more HTML5 form controls.
Web authors can now get touch events from Firefox users on Windows 7 machines.
A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently.

New in Firefox 3.6.9 (Sep 8, 2010)

New in Firefox 4.0 Beta 4 (Aug 25, 2010)

Firefox 4 Beta 4 is available in 39 languages.
Firefox Sync is now included by default.
A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped.
An experimental API is included to provide more efficient Javascript animations.
Firefox now supports the HTML5 video "buffered" property.
As well as these features from previous Firefox 4 Betas:
Tabs are now on top by default on Windows and OSX - Linux will be changing when the theme has been modified to support the change.
You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu.
Web developers can animate content using CSS Transitions.
Responsiveness and scrolling improvements from the new retained layers layout system.
JavaScript speed improvements due to engine optimizations.
Changes to how XPCOM components are registered in order to help startup time and process separation.
You can search for and switch to already open tabs in the Smart Location Bar.
New Addons Manager and extension management API (UI will be changed before final release).
Significant API improvements are available for JS-ctypes, a foreign function interface for extensions.
The stop and reload buttons have been merged into a single button on Windows, Mac and Linux.
The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like).
Crash protection for Windows, Linux, and Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins.
CSS Transitions are partially supported.
Full WebGL support is included but disabled by default at this time.
Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently.
Native support for the HD HTML5 WebM video format.
An experimental Direct2D rendering backend is available on Windows, turned off by default.
Web developers can use Websockets for a low complexity, low latency, bidirectional communications API.
Web developers can update the URL field without reloading the page using HTML History APIs.
More responsive page rendering using lazy frame construction.
Link history lookup is done asynchronously to provide better responsiveness during pageload.
CSS :visited selectors have been changed to block websites from being able to check a user's browsing history.
New HTML5 parser.
Support for more HTML5 form controls.
Web authors can now get touch events from Firefox users on Windows 7 machines.
A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently.

New in Firefox 4.0 Beta 3 (Aug 12, 2010)

Firefox 4 Beta 3 is available in 34 languages.
Web authors can now get touch events from Firefox users on Windows 7 machines.
A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently.
See the complete changelist from the previous beta.
As well as these features from previous Firefox 4 Betas:
Tabs are now on top by default on Windows and OSXLinux will be changing when the theme has been modified to support the change.
You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu.
Web developers can animate content using CSS Transitions.
Responsiveness and scrolling improvements from the new retained layers layout system.
JavaScript speed improvements due to engine optimizations.
Changes to how XPCOM components are registered in order to help startup time and process separation.
You can search for and switch to already open tabs in the Smart Location Bar
New Addons Manager and extension management API (UI will be changed before final release)
Significant API improvements are available for JS-ctypes, a foreign function interface for extensions.
The stop and reload buttons have been merged into a single button on Windows, Mac and Linux.
The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like).
Crash protection for Windows, Linux, and Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins.
CSS Transitions are partially supported.
Full WebGL support is included but disabled by default at this time.
Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently.
Native support for the HD HTML5 WebM video format.
An experimental Direct2D rendering backend is available on Windows, turned off by default.
Web developers can use Websockets for a low complexity, low latency, bidirectional communications API.
Web developers can update the URL field without reloading the page using HTML History APIs.
More responsive page rendering using lazy frame construction.
Link history lookup is done asynchronously to provide better responsiveness during pageload.
CSS :visited selectors have been changed to block websites from being able to check a user's browsing history.
New HTML5 parser.
Support for more HTML5 form controls.

New in Firefox 4.0 Beta 2 (Jul 28, 2010)

New in Firefox 3.6.8 (Jul 24, 2010)

New in Firefox 4.0 Beta 1 (Jul 7, 2010)

New in Firefox 3.6.6 (Jun 27, 2010)

New in Firefox 3.6.4 (Jun 23, 2010)

New in Firefox 3.7 Alpha 4 (Apr 9, 2010)

New in Firefox 3.6.3 Plugin 1 "Lorentz" (Apr 9, 2010)

New in Firefox 3.6.3 (Apr 2, 2010)

New in Firefox 3.5.9 (Mar 31, 2010)

New in Firefox 3.5.8 (Mar 31, 2010)

New in Firefox 3.6.2 (Mar 23, 2010)

New in Firefox 3.7 Alpha 2 (Mar 3, 2010)

New in Firefox 3.6 Beta 3 (Jan 21, 2010)

New in Firefox 3.5.7 (Jan 21, 2010)

New in Firefox 3.5.6 (Jan 21, 2010)

New in Firefox 3.5.5 (Nov 6, 2009)

New in Firefox 3.5.4 (Oct 28, 2009)

New in Firefox 3.5.3 (Sep 10, 2009)

New in Firefox 3.5.2 (Aug 4, 2009)

New in Firefox 3.0.13 (Aug 4, 2009)

New in Firefox 3.5.2 Build 1 Beta (Aug 3, 2009)

New in Firefox 3.5.1 (Jul 20, 2009)

New in Firefox 3.5 Preview Beta 99 (Jun 9, 2009)

New in Firefox 3.5 Beta 4 (Apr 28, 2009)

New in Firefox 3.0.9 (Apr 21, 2009)

New in Firefox 3.0.8 (Mar 27, 2009)

New in Firefox 3.0.7 (Mar 4, 2009)

New in Firefox 3.0 Final (Jun 17, 2008)

More Secure
One-click site info: Click the site favicon in the location bar to see who owns the site and to check if your connection is protected from eavesdropping. Identity verification is prominently displayed and easier to understand. When a site uses Extended Validation (EV) SSL certificates, the site favicon button will turn green and show the name of the company you're connected to. (Try it here!)
Malware Protection: malware protection warns users when they arrive at sites which are known to install viruses, spyware, trojans or other malware. (Try it here!)
New Web Forgery Protection page: the content of pages suspected as web forgeries is no longer shown. (Try it here!)
New SSL error pages: clearer and stricter error pages are used when Firefox encounters an invalid SSL certificate. (Try it here!)
Add-ons and Plugin version check: Firefox now automatically checks add-on and plugin versions and will disable older, insecure versions.
Secure add-on updates: to improve add-on update security, add-ons that provide updates in an insecure manner will be disabled.
Anti-virus integration: Firefox will inform anti-virus software when downloading executables.
Vista Parental Controls: Firefox now respects the Vista system-wide parental control setting for disabling file downloads.
Effective top-level domain (eTLD) service better restricts cookies and other restricted content to a single domain.
Better protection against cross-site JSON data leaks.
Easier to Use
Easier password management: an information bar replaces the old password dialog so you can now save passwords after a successful login.
Simplified add-on installation: the add-ons whitelist has been removed making it possible to install extensions from third-party sites in fewer clicks.
New Download Manager: the revised download manager makes it much easier to locate downloaded files, and you can see and search on the name of the website where a file came from. Your active downloads and time remaining are always shown in the status bar as your files download.
Resumable downloading: users can now resume downloads after restarting the browser or resetting your network connection.
Full page zoom: from the View menu and via keyboard shortcuts, the new zooming feature lets you zoom in and out of entire pages, scaling the layout, text and images, or optionally only the text size. Your settings will be remembered whenever you return to the site.
Podcasts and Videocasts can be associated with your media playback tools.
Tab scrolling and quickmenu: tabs are easier to locate with the new tab scrolling and tab quickmenu.
Save what you were doing: Firefox will prompt users to save tabs on exit.
Optimized Open in Tabs behavior: opening a folder of bookmarks in tabs now appends the new tabs rather than overwriting.
Location and Search bar size can now be customized with a simple resizer item.
Text selection improvements: multiple text selections can be made with Ctrl/Cmd; double-click drag selects in "word-by-word" mode; triple-clicking selects a paragraph.
Find toolbar: the Find toolbar now opens with the current selection.
Plugin management: users can disable individual plugins in the Add-on Manager.
Integration with Windows: Firefox now has improved Windows icons, and uses native user interface widgets in the browser and in web forms.
Integration with the Mac: the new Firefox theme makes toolbars, icons, and other user interface elements look like a native OS X application. Firefox also uses OS X widgets and supports Growl for notifications of completed downloads and available updates. A combined back and forward control make it even easier to move between web pages.
Integration with Linux: Firefox's default icons, buttons, and menu styles now use the native GTK theme.
More Personal
Star button: quickly add bookmarks from the location bar with a single click; a second click lets you file and tag them.
Tags: associate keywords with your bookmarks to sort them by topic.
Location bar & auto-complete: type in all or part of the title, tag or address of a page to see a list of matches from your history and bookmarks; a new display makes it easier to scan through the matching results and find that page you're looking for. Results are returned according to their frecency (a combination of frequency and recency of visits to that page) ensuring that you're seeing the most relevant matches. An adaptive learning algorithm further tunes the results to your patterns!
Smart Bookmarks Folder: quickly access your recently bookmarked and tagged pages, as well as your more frequently visited pages with the new smart bookmarks folder on your bookmark toolbar.
Places Organizer: view, organize and search through all of your bookmarks, tags, and browsing history with multiple views and smart folders to store your frequent searches. Create and restore full backups whenever you want.
Web-based protocol handlers: web applications, such as your favorite webmail provider, can now be used instead of desktop applications for handling mailto: links from other sites. Similar support is available for other protocols (Web applications will have to first enable this by registering as handlers with Firefox).
Download & Install Add-ons: the Add-ons Manager (Tools > Add-ons) can now be used to download and install a Firefox customization from the thousands of Add-ons available from our community add-ons website. When you first open the Add-ons Manager, a list of recommended Add-ons is shown.
Easy to use Download Actions: a new Applications preferences pane provides a better UI for configuring handlers for various file types and protocol schemes.
Improved Platform for Developers
New graphics and font handling: new graphics and text rendering architectures in Gecko 1.9 provides rendering improvements in CSS, SVG as well as improved display of fonts with ligatures and complex scripts.
Color management: (set gfx.color_management.enabled on in about:config and restart the browser to enable.) Firefox can now adjust images with embedded color profiles.
Offline support: enables web applications to provide offline functionality (website authors must add support for offline browsing to their site for this feature to be available to users).
A more complete overview of Firefox 3 for developers is available for website and add-on developers.
Improved Performance
Speed: improvements to our JavaScript engine as well as profile guided optimizations have resulted in continued improvements in performance. Compared to Firefox 2, web applications like Google Mail and Zoho Office run twice as fast in Firefox 3, and the popular SunSpider test from Apple shows improvements over previous releases.
Memory usage: Several new technologies work together to reduce the amount of memory used by Firefox 3 over a web browsing session. Memory cycles are broken and collected by an automated cycle collector, a new memory allocator reduces fragmentation, hundreds of leaks have been fixed, and caching strategies have been tuned.
Reliability: A user's bookmarks, history, cookies, and preferences are now stored in a transactionally secure database format which will prevent data loss even if their system crashes.