Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
User-Agent Switcher and Manager
Spoofs User-Agent strings of your browser with a new one globally, randomly or per hostname
19,397 users
View Page Archive & Cache
View archived and cached versions of web pages on 10+ search engines, such as the Wayback Machine, Archive.is, Google, Bing, Yandex, Gigablast, WebCite, Sogou, Memento, Naver and Yahoo Japan.
3,444 users
Google™ Translator Lite
a powerful tool to translate words or sentences
27,903 users
YouTube Video and Audio Downloader (WebEx)
Download YouTube videos in all available formats and extract the original audio files
111,860 users
Gesturefy
Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.
117,163 users
Clippings
Save frequently-entered text for pasting later.
34,635 users
Tomato Clock
Tomato Clock is a simple browser extension for managing your productivity.
14,943 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.
6,083 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
504,727 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.
42,593 users
Iridium for YouTube
YouTube with more freedom
15,297 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!)
16,399 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.
12,125 users
RSSPreview
Preview RSS feeds in browser
4,306 users
Feed Preview
Indicates available RSS and Atom feeds and renders previews.
2,840 users
mPage
Simple dashboard-like RSS feed reader.
667 users