Extensions are like apps for your browser.

They add features to Firefox to make browsing faster, smarter, or just plain fun.

Featured extensions
  • Feedbro

    Feedbro

    Advanced Feed Reader - Read news & blogs or any RSS/Atom/RDF source.

    39,510 users

  • Forecastfox (fix version)

    Forecastfox (fix version)

    Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

    40,234 users

  • AdBlock for Firefox

    AdBlock for Firefox

    The most popular ad blocker for Chrome and Safari, now available for Firefox! Block all advertisements on all web pages, even Facebook, Youtube, and Hulu. Browse faster, too! Most ads aren't even downloaded at all, saving you time and bandwidth.

    1,208,216 users

  • Tab Center Redux

    Tab Center Redux

    Move your tabs to the side of your browser window.

    11,427 users

Productivity extensions
  • Gesturefy

    Gesturefy

    Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.

    115,235 users

  • Clippings

    Clippings

    Save frequently-entered text for pasting later.

    33,144 users

  • Tomato Clock

    Tomato Clock

    Tomato Clock is a simple browser extension for managing your productivity.

    15,795 users

  • Impulse Blocker

    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.

    6,348 users

Featured themes
YouTube boosters
  • Enhancer for YouTube™

    Enhancer for YouTube™

    Tons of features to improve your user experience on YouTube™.

    502,532 users

  • Turn Off the Lights

    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.

    42,672 users

  • Iridium for YouTube

    Iridium for YouTube

    YouTube with more freedom

    14,798 users

  • SoundFixer

    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!)

    16,643 users

Feed readers
  • Brief

    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.

    12,003 users

  • RSSPreview

    RSSPreview

    Preview RSS feeds in browser

    4,586 users

  • Feed Preview

    Feed Preview

    Indicates available RSS and Atom feeds and renders previews.

    2,948 users

  • mPage

    mPage

    Simple dashboard-like RSS feed reader.

    756 users