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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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Elite ad blockers
Elite ad blockers
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YouTube customization
YouTube customization
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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.

    202,456 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.

    207,468 users

  • TinEye Reverse Image Search

    TinEye Reverse Image Search

    Click on any image on the web to search for it on TinEye. Recommended by Firefox! Discover where an image came from, see how it is being used, check if modified versions exist or locate high resolution versions. Made with love by the TinEye team.

    62,928 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.

    35,933 users

Steam enhancers
  • SteamDB

    SteamDB

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

    23,789 users

  • Augmented Steam

    Augmented Steam

    Augments your Steam Experience

    27,158 users

  • Steam URL Opener

    Steam URL Opener

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

    1,238 users

  • ProtonDB for Steam

    ProtonDB for Steam

    Shows ratings from protondb.com on Steam

    1,441 users

“chat” tagged extensions
  • Pinned Tab for WhatsApp Web

    Pinned Tab for WhatsApp Web

    Go to the pinned WhatsApp Web tab. If it doesn't exist, it's created. WhatsApp doesn’t endorse or sponsor this project.

    27,703 users

  • 划词翻译

    划词翻译

    一站式划词 / 截图 / 网页全文 / 音视频翻译扩展,支持谷歌、DeepL、百度、搜狗等 9 个国内外主流翻译源,且均可用于网页翻译。能对比、朗读、复制翻译结果。能在 PDF 里使用。支持辅助键、快捷键、悬浮取词。

    24,890 users

  • Twitch Chat pronouns

    Twitch Chat pronouns

    Add Pronouns to Twitch Chat

    8,905 users

  • Privacy Extension For WhatsApp™ Web

    Privacy Extension For WhatsApp™ Web

    The Privacy Extension For WhatsApp™ Web hides your messages from unwanted glimpses until you hover over them. In the search bar, you can disable the blur effect on all messages manually and specify what elements to blur.

    6,263 users