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EPUBReader

Read ePUB files right in Firefox—increase font size, page dimensions & more.
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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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Privacy & Security extensions
Privacy & Security extensions
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Tab managers
Tab managers
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Spotlight: Adaptive Tab Bar Color
Spotlight: Adaptive Tab Bar Color
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Extension starter pack
  • Privacy Badger

    Privacy Badger

    Automatically learns to block invisible trackers.

    1,793,017 users

  • Enhancer for YouTube™

    Enhancer for YouTube™

    Take control of YouTube and boost your user experience!

    671,376 users

  • 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.

    404,940 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.

    391,086 users

Creativity extensions
  • 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.

    112,031 users

  • 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.

    404,940 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.

    391,086 users

  • Dictionary Anywhere

    Dictionary Anywhere

    View definitions easily as you browse the web. Double-click any word to view its definition in a small pop-up bubble. It also supports Spanish, German, French language alongside English. Enjoy Reading Uninterrupted!!!.

    49,807 users

Steam enhancers
  • SteamDB

    SteamDB

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

    66,338 users

  • Augmented Steam

    Augmented Steam

    Augments your Steam Experience

    61,395 users

  • Steam URL Opener

    Steam URL Opener

    Allows you to open URLs inside Steam Client to save the hassle of logging in normal browser (with a single click on a button).

    6,264 users

  • ProtonDB for Steam

    ProtonDB for Steam

    Shows ratings from <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/f8db0358d96c1a46b9a77aa02190de811e40819051b1d42dd013c17276046ffd/http%3A//protondb.com" rel="nofollow">protondb.com</a> on Steam

    3,923 users

“translate” tagged extensions
  • To Google Translate

    To Google Translate

    Right-click a section of text and click the Translate icon next to it to text translate or listen to it in your language.

    901,516 users

  • Simple Translate

    Simple Translate

    Quickly translate selected or typed text on web pages. Supports Google Translate and DeepL API.

    321,974 users

  • TWP - Translate Web Pages

    TWP - Translate Web Pages

    Translate your page in real time using Google or Yandex. It is not necessary to open new tabs. Now works with the NoScript Extension.

    647,809 users

  • DeepL Translate: Reading & writing translator

    DeepL Translate: Reading & writing translator

    Translate while you read and write with DeepL Translate, the world’s most accurate translator.

    183,555 users