Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Impulse Blocker
Block distracting websites when you are browsing the web. You can list websites that you don't want to visit in the settings. You can pause or turn off the blocker quickly. Completely open source.
6,171 users
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory.
4,966,032 users
Video Background Play Fix
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.
27,387 users
Adblock Plus
Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
10,781,063 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
508,271 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!)
14,439 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.
198,828 users
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
31,677 users
Wikiwand: Wikipedia Modernized
Good old Wikipedia gets a great new look
17,555 users
Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
3,366 users
Wikipedia Context Menu Search
Search for highlighted text on Wikipedia via the context menu.
2,967 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
Tree Style Tab
Show tabs like a tree.
132,229 users
New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
107,880 users
Tab Auto Refresh
Automatically refresh tabs based on custom time intervals
54,994 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
82,922 users