Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
Midnight Lizard
Custom color schemes for all websites: night mode, dark themes, blue light filter, screen shader, high contrast, grayscale, etc.
4,407 users
Transparent standalone images
This add-on renders standalone images on a transparent background, so you can see the image in all its glory!
2,488 users
Country Flags & IP Whois
Displays country flag of website's server location, Whois and Geo info on a browser addressbar icon
22,762 users
Font Finder (revived)
An easy-to-use font inspector to get CSS styles of the selected element
21,786 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