Extensions are like apps for your browser.

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

Featured extensions
  • NoScript Security Suite

    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

    1,532,068 users

  • Cookie AutoDelete

    Cookie AutoDelete

    Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Whitelist the ones you trust while deleting the rest. Support for Container Tabs.

    209,164 users

  • HTTPS Everywhere

    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.

    567,953 users

  • Google Search Fixer

    Google Search Fixer

    Override the user-agent string presented to Google Search pages to receive the search experience shown to Chrome.

    9,580 users

Productivity extensions
  • Gesturefy

    Gesturefy

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

    118,404 users

  • Clippings

    Clippings

    Save frequently-entered text for pasting later.

    35,931 users

  • Tomato Clock

    Tomato Clock

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

    16,380 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.

    6,493 users

Featured themes
YouTube boosters
  • Enhancer for YouTube™

    Enhancer for YouTube™

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

    511,650 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.

    43,145 users

  • Iridium for YouTube

    Iridium for YouTube

    YouTube with more freedom

    14,852 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!)

    16,925 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.

    12,332 users

  • RSSPreview

    RSSPreview

    Preview RSS feeds in browser

    4,776 users

  • Feed Preview

    Feed Preview

    Indicates available RSS and Atom feeds and renders previews.

    3,034 users

  • mPage

    mPage

    Simple dashboard-like RSS feed reader.

    743 users