Extensions are like apps for your browser.

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

Featured extensions
  • Undo Close Tab

    Undo Close Tab

    Allows you to restore the last closed tab with just one button click and gives you access to the list of recently closed tabs in the button context menu.

    30,267 users

  • Tab notifier

    Tab notifier

    Enables desktop notifications like in Chrome (e.g. Gmail, imo.im) and, if the site doesn't support them, it can notify new messages or updates detecting changes of the title (e.g. Hotmail, Yahoo, Facebook, Twitter). Even if the browser is minimized!

    1,400 users

  • Forget Me Not - Forget cookies & other data

    Forget Me Not - Forget cookies & other data

    Make the browser forget website data (like cookies, local storage, etc.), except for the data you want to keep by adding domains to a whitelist, graylist, blacklist, or redlist.

    9,716 users

  • Tree Style Tab

    Tree Style Tab

    Show tabs like a tree.

    138,031 users

Productivity extensions
  • Gesturefy

    Gesturefy

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

    116,180 users

  • Clippings

    Clippings

    Save frequently-entered text for pasting later.

    33,991 users

  • Tomato Clock

    Tomato Clock

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

    15,984 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.

    6,417 users

Featured themes
YouTube boosters
  • Enhancer for YouTube™

    Enhancer for YouTube™

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

    505,816 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.

    42,725 users

  • Iridium for YouTube

    Iridium for YouTube

    YouTube with more freedom

    14,699 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!)

    16,766 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.

    12,076 users

  • RSSPreview

    RSSPreview

    Preview RSS feeds in browser

    4,679 users

  • Feed Preview

    Feed Preview

    Indicates available RSS and Atom feeds and renders previews.

    2,965 users

  • mPage

    mPage

    Simple dashboard-like RSS feed reader.

    721 users