Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
HTTPS Everywhere
Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.
551,672 users
NoScript Security Suite
The best security you can get in a web browser! Allow active content to run only from sites you trust, and protect yourself against XSS other web security exploits. Disabled and can't reinstall? https://tinyurl.com/moz-ext-cert
1,538,442 users
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory.
4,787,603 users
Search by Image - Reverse Image Search
Reverse image search using various search engines, such as Google, Bing, Yandex, Baidu and TinEye.
67,529 users
Gesturefy
Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.
116,519 users
Clippings
Save frequently-entered text for pasting later.
34,274 users
Tomato Clock
Tomato Clock is a simple browser extension for managing your productivity.
14,846 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.
6,053 users
Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
502,457 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.
42,362 users
Iridium for YouTube
YouTube with more freedom
15,257 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!)
16,322 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.
12,048 users
RSSPreview
Preview RSS feeds in browser
4,265 users
Feed Preview
Indicates available RSS and Atom feeds and renders previews.
2,818 users
mPage
Simple dashboard-like RSS feed reader.
663 users