Never Duplicates 1.0.0

Never Duplicates is a useful add-on that was created in order to help you avoid having two or more opened tabs with the same webpage loaded.

The extension will not add any buttons to your Opera web browser as it works in the background and instantly closes any tab that tries to load a page that's already open in a different tab.

Note: In order to install the extension you need to drag and drop the downloaded file on the browser window.