Add-ons (also known as extensions) are small programs that run inside web browsers like
Mozilla Firefox. They add extra features to the browser without having to download anything
new. You can use extensions to make browsing faster, easier, and safer. Some extensions even
let you do things like translate text on websites, search the web, and play games.
There are over 28,000 Firefox-addons and 480,000 themes, making it hard to find the best
ones. so we have created a way to sort through all of them. Use the dropdown above to set
different filters. Add-ons are sorted by number of active users.
To set even more advanced filters, and sort the Firefox add-ons differently,
please visit our Advanced search tool. Note that Advanced
search tool is only available to premium members.
Helps you fix annoying sound problems on sites like YouTube: audio in one channel only, too quiet or too loud.
(Unfortunately, this extension does not work on all websites because of cross-domain issues — but it does work on YouTube!)
Some sites may not work with Firefox for Android video background play feature. This add-on provides a quick fix by blocking the Page Visibility API and the Fullscreen API.
Directly download tracks on soundcloud.com. Creates metadata tags for Title, Artists, Album & Artwork. Allows to block reposts in your Stream feed and more.
YouTube High Definition is a powerful tool that automatically plays all YouTube videos in HD, changes video player size, offers auto-stop and mute, and much more.
Chrome-Stats extension
#1, SoundFixer 
