Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Social Fixer
Social Fixer for Facebook fixes annoyances, adds features, and enhances existing functionality to make FB more fun and efficient. Filter the news feed, hide sponsored posts and political posts, hide parts of the page you don't want to see, and more!
17,364 users
Share Backported
This extension reimplements the share feature in Firefox with container support (also for Facebook container), many social networks and services supported!
2,133 users
Privacy Possum
Privacy Possum monkey wrenches common commercial tracking methods by reducing and falsifying the data gathered by tracking companies.
120,616 users
YouTube Video and Audio Downloader (WebEx)
Download YouTube videos in all available formats and extract the original audio files
118,044 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
513,894 users
SoundFixer
Lets you fix annoying sound problems in YouTube videos and such. Like audio in one channel only, too quiet or too loud. (Unfortunately, doesn't work on many other websites because of cross-domain issues — but it does work on YouTube.com!)
14,190 users
YouTube High Definition
YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.
201,708 users
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
32,084 users
Wikiwand: Wikipedia Modernized
Good old Wikipedia gets a great new look
17,806 users
Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
3,396 users
Wikipedia Context Menu Search
Search for highlighted text on Wikipedia via the context menu.
3,007 users
Random Unusual Wikipedia new tab
Redirects to a random unusual Wikipedia page when you open a new tab, because when you're opening a new tab you're looking for a distraction and that distraction might as well be a weird fact. Or show random Cognitive Bias, or Philosophical concept.
71 users
New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
110,342 users
Tree Style Tab
Show tabs like a tree.
135,202 users
Tab Auto Refresh
Automatically refresh tabs based on custom time intervals
56,241 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
84,312 users