Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory.
4,895,048 users
IP Address and Domain Information
The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.
26,196 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.
180,282 users
Tab Reloader (page auto refresh)
An easy-to-use tab reloader with custom reloading time settings for individual tabs
20,198 users
Gesturefy
Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.
119,690 users
Clippings
Save frequently-entered text for pasting later.
36,487 users
Tomato Clock
Tomato Clock is a simple browser extension for managing your productivity.
15,346 users
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.
6,164 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
510,553 users
Turn Off the Lights
The entire page will be fading to dark, so you can watch the videos as if you were in the cinema. Works for YouTube™ and Beyond. It works for all known video sites such as YouTube, Vimeo, Twitch, Dailymotion, Facebook, Hulu, Metacafe, YouKu, etc.
43,067 users
Iridium for YouTube
YouTube with more freedom
15,414 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!)
16,565 users
Brief
Brief makes reading RSS feeds as easy and intuitive as it gets. Designed to have exactly the right set of features, it is powerful and simple at the same time. Feeds are presented on a seamless, interactive page which let's you bookmark and tag items with a single click.
12,406 users
RSSPreview
Preview RSS feeds in browser
4,414 users
Feed Preview
Indicates available RSS and Atom feeds and renders previews.
2,911 users
mPage
Simple dashboard-like RSS feed reader.
686 users