MeasureIt for Firefox
Monitors keep getting fitted with more and more pixels for your images and videos to be flawless, because the more the merrier. This also helps developers measure various elements, with resolutions being standard boxes of specific height and width. In this regard, MeasureIt for Firefox gives you the possibility to measure different parts of a web page content.
Neatly integrates in your web browser
As the name suggests, the application integrates itself into Mozilla Firefox, so you need to be using it to benefit from what MeasureIt has to offer. It doesn't take a lot of time to deploy, with the result adding a small button to your toolbar to quickly and easily access the given ruler.
There's not a lot of variety in terms of features, with all your effort narrowing down to dragging a box over the area of interest. You're free to move and resize the box after it's created. A small tooltip is attached in order to show you height and width in pixels.
Change colors and displayed values
The opened web page is faded, with the box you create being a transparent color gradient so you can view the whole content. It needs to be triggered for every page you're on, while turning it off is done either through a tooltip button or hitting the toolbar icon again.
A few controls can be managed to tweak the utility, but not a lot. As such, color and opacity levels can be set both for the ruler and background, but there's no preview so you need to switch between the tool and options menu for each minor change. There's also a misc tab in the options menu, but it only holds the option to display area and diagonal info in the tooltip.
Sadly, you depend on the tooltip for all data on pixels. There's no shortcut to have values sent to your clipboard, nor save an image. The ruler is fitted with gradation lines, but no numerical values, which would have greatly come in handy.
On an ending note
Taking everything into consideration, we can say that MeasureIt for Firefox is a practical little measuring utility you might want to keep around in case you're browsing with Firefox. Although pretty simple and easy to grasp, it feels a little rough around the edges and could have used more attention to details.