Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
31,783 users
Black Menu for Google™
The easiest access to the Google universe
6,886 users
AdBlocker Ultimate
Free and improved ad blocker. Completely remove ALL ads. No "acceptable" ads or whitelisted advertisers, block tracking, block malware!
423,724 users
Tile Tabs WE
Take tabs from parent windows and arrange them in layouts of tiled sub-windows, using the toolbar button, context menu or keyboard shortcuts. Makes it easy to browse, compare or monitor multiple pages. Synchronize scroll. Save and re-open layouts.
23,326 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
510,860 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!)
13,740 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.
201,319 users
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
31,783 users
Wikiwand: Wikipedia Modernized
Good old Wikipedia gets a great new look
17,609 users
Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
3,367 users
Wikipedia Context Menu Search
Search for highlighted text on Wikipedia via the context menu.
2,986 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.
70 users
New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
108,893 users
Tree Style Tab
Show tabs like a tree.
133,222 users
Tab Auto Refresh
Automatically refresh tabs based on custom time intervals
55,213 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
83,387 users