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Extensions are like apps for Firefox.

They add features to Firefox to make browsing faster, safer, or just plain fun.
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Translation tools
Translation tools
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YouTube customization
YouTube customization
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Extension starter pack
Extension starter pack
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Creativity extensions
  • Grammar and Spell Checker - LanguageTool

    Grammar and Spell Checker - LanguageTool

    With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.

    204,865 users

  • Search by Image

    Search by Image

    A powerful reverse image search tool, with support for various search engines, such as Google, Bing, Yandex, Baidu and TinEye.

    203,672 users

  • Dark Background and Light Text

    Dark Background and Light Text

    Make every web page (or just the pages you want) display light text on dark backgrounds. All color variations are fully customizable.

    32,089 users

  • LeechBlock NG

    LeechBlock NG

    LeechBlock NG is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.

    54,193 users

Elite ad blockers
  • uBlock Origin

    uBlock Origin

    Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

    5,347,660 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.

    955,489 users

  • Ghostery – Privacy Ad Blocker

    Ghostery – Privacy Ad Blocker

    Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.

    1,057,833 users

  • AdGuard AdBlocker

    AdGuard AdBlocker

    Unmatched adblock extension against advertising and pop-ups. Blocks ads on Facebook, Youtube and all other websites.

    757,311 users

Steam enhancers
  • SteamDB

    SteamDB

    Adds SteamDB links and new features on the Steam store and community. View lowest game prices and stats.

    27,395 users

  • Augmented Steam

    Augmented Steam

    Augments your Steam Experience

    27,966 users

  • Steam URL Opener

    Steam URL Opener

    Allows you to open URLs inside Steam Client to save the hassle of logging in normal browser.

    1,508 users

  • ProtonDB for Steam

    ProtonDB for Steam

    Shows ratings from protondb.com on Steam

    1,485 users

“mp3” tagged extensions
  • Easy Youtube Video Downloader Express

    Easy Youtube Video Downloader Express

    A simple extension for superfast and easy YouTube downloads in FLV, 3GP, MP3, MP4, 720p, and 1080p formats.

    554,879 users

  • 600% Sound Volume

    600% Sound Volume

    Up to 600% volume boost

    70,559 users

  • Global Speed

    Global Speed

    Set a default speed for video and audio.

    56,339 users

  • YouTube mp3

    YouTube mp3

    The 320 kbps YouTube mp3 addon generates a "MP3" button on YouTube. Convert YouTube to mp3 and download the file to your device.

    38,154 users