Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Image Search Options
Image Search Options provides a set of highly customizable reverse image search context menu options.
52,027 users
Imagus
Enlarge thumbnails, and show images/videos from links with a mouse hover.
73,418 users
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
31,392 users
AdBlock for Firefox
The most popular ad blocker for Chrome and Safari, now available for Firefox! Block all advertisements on all web pages, even Facebook, Youtube, and Hulu. Browse faster, too! Most ads aren't even downloaded at all, saving you time and bandwidth.
1,352,142 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
503,792 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!)
15,083 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.
196,102 users
Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
31,392 users
Wikiwand: Wikipedia Modernized
Good old Wikipedia gets a great new look
17,393 users
Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
3,347 users
Wikipedia Context Menu Search
Search for highlighted text on Wikipedia via the context menu.
2,940 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.
73 users
New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
105,649 users
Tree Style Tab
Show tabs like a tree.
129,451 users
Tab Auto Refresh
Automatically refresh tabs based on custom time intervals
53,663 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
81,647 users