Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Group Speed Dial
Speed Dial / visual bookmarks with groups for power users. Now you can fit all your favorite sites into one fast SpeedDial in an organized fashion. Dials are synchronized through Cloud to all your devices! For free! No Ads! www.FastAddons.com
56,910 users
Zoom Page WE
Zoom web pages (either per-site or per-tab) using full-page zoom, text-only zoom and minimum font size. Fit-to-width zooming can be applied to pages automatically. Fit-to-window scaling can be applied to small images.
53,228 users
Full Screen for Firefox
Go full screen with one click on the full screen button. That includes also the full screen movies such as the YouTube, Vimeo, Dailymotion, Youku video player, etc.
6,106 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.
11,639 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