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.
6 244 users
Google Search Fixer
Override the user-agent string presented to Google Search pages to receive the search experience shown to Chrome.
8 339 users
HTTPS Everywhere
Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.
553 108 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).
11 003 311 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