Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Gesturefy
Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.
115,659 users
Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
3,342 users
Dictionary (Google™ Translate) Anywhere
"Dictionary (Google™ Translate) Anywhere" extension provides access to a floating multilingual Google Translate panel on any webpage.
24,967 users
TinEye Reverse Image Search
TinEye is a reverse image search engine. The extension adds a context menu item so you can search for an image to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions.
63,290 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
503,470 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!)
14,692 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.
196,491 users
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
31,344 users
Wikiwand: Wikipedia Modernized
Good old Wikipedia gets a great new look
17,343 users
Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
3,342 users
Wikipedia Context Menu Search
Search for highlighted text on Wikipedia via the context menu.
2,934 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.
72 users
Tree Style Tab
Show tabs like a tree.
129,519 users
New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
105,620 users
Tab Auto Refresh
Automatically refresh tabs based on custom time intervals
53,720 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
81,669 users