Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
510,860 users
Resurrect Pages
Dead pages, broken links, the scourge of the internet. Powerhouse sites like Slashdot and Digg can bring a server to its knees. What do we do when a page is dead but we still want to see it? Call in the clerics, and perform a resurrection...
10,865 users
YouTube in HD (720p, 1080p, 1440p, 2160p)
Watch YouTube in the full-HD quality or the highest available one
14,119 users
Forget Me Not - Forget cookies & other data
Make the browser forget website data (like cookies, local storage, etc.), except for the data you want to keep by adding domains to a whitelist, graylist, blacklist, or redlist.
11,783 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