Useful Firefox Extensions

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worlddestroyerlaromList by worlddestroyerlarom, last updated 
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  1. Essential

  2. This efficient browser add-on blocks ads, trackers, and malware by default employing various filter lists, acting as a comprehensive wide-spectrum blocker.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Microsoft Edge
    • Vivaldi
    • Google Chrome
    • Pale Moon
    • Thunderbird
    • Opera
    • Node.JS
    • Chromium
    • Mozilla Firefox
    uBlock Origin screenshot 1
    uBlock Origin screenshot 1
  3. Bitwarden icon
     Like

    Open-source password manager with AES-256 encryption and device sync. Store and access encrypted logins across platforms like iOS and Android.

    Cost / License

    • Freemium
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • Apple Watch
    • Snapcraft
    • Microsoft Edge
    • Vivaldi
    • Google Chrome
    • Flathub
    • Microsoft SQL Server
    • Tor Browser
    • Safari
    • F-Droid
    • Software as a Service (SaaS)
    • Flatpak
    • Cloudron
    • Opera
    • Chocolatey
    • Mono
    • Brave
    • Mozilla Firefox
    • Docker
    Bitwarden screenshot 1
    Bitwarden screenshot 1
    Bitwarden screenshot 2
    +10
    Bitwarden screenshot 3
  4. Flagfox icon
     Like

    Flagfox is a Firefox extension that displays a flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, WhoIs, similar sites, and more.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Mozilla Firefox
    Flagfox screenshot 1
    Flagfox screenshot 1
    Flagfox screenshot 2
    +2
    Flagfox screenshot 3
  5. The Firefox Multi-Account Containers extension lets you carve out a separate box for each of your online lives – no more opening a different browser just to check your work email! Here is a quick video showing you how it works.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Firefox
    Firefox Multi-account Containers screenshot 1
    Firefox Multi-account Containers screenshot 1
    Firefox Multi-account Containers screenshot 2
  6. This extension helps you control more of your web activity from Facebook by isolating your identity into a separate container.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Facebook
    • Mozilla Firefox
    Facebook Container screenshot 1
  7. This eye-care extension enables night mode creating dark themes for websites on the fly. Dark Reader inverts bright colors making them high contrast and easy to read at night.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • iPhone
    • iPad
    • Microsoft Edge
    • Google Chrome
    • Safari
    • Thunderbird
    • Mozilla Firefox
    Dark Reader screenshot 1
    Dark Reader screenshot 1
    Dark Reader screenshot 2
    +1
    Dark Reader screenshot 3
  8. A powerful reverse image search tool, with support for various search engines, such as Google, Bing, Yandex, Baidu and TinEye.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • iPhone
    • iPad
    • Microsoft Edge
    • Google Chrome
    • Samsung Galaxy Store
    • Opera
    • Mozilla Firefox
    Search by Image screenshot 1
    Search by Image screenshot 1
    Search by Image screenshot 2
    +5
    Search by Image screenshot 3
  9. An AI-powered proofreading tool supports over 20 languages, offering free and premium versions with extensive grammar checks across multiple apps.

    Cost / License

    • Freemium
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • iPhone
    • iPad
    • Microsoft Edge
    • ONLYOFFICE
    • Google Chrome
    • Microsoft Outlook
    • Safari
    • Visual Studio Code
    • Microsoft Word
    • Eclipse
    • TinyMCE
    • Google Docs
    • Thunderbird
    • Vim
    • Sublime Text
    • GNU Emacs
    • Opera
    • Gmail
    • LibreOffice
    • Apache OpenOffice
    • Mozilla Firefox
    • LibreOffice - Writer
    • Cloudron
    LanguageTool screenshot 1
    LanguageTool screenshot 1
    LanguageTool screenshot 2
    +4
    LanguageTool in OpenOffice.org 3.x
  10. WebExtensions for translating text on web pages. Contribute to sienori/simple-translate development by creating an account on GitHub.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Microsoft Edge
    • Google Chrome
    • Firefox
  11. SponsorBlock is a browser extension and open API via crowdsource for skipping sponsor segments in YouTube videos. It's open-source. Users submit when a sponsor happens from the extension, and the extension automatically skips sponsors it knows about using a privacy...

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Microsoft Edge
    • Google Chrome
    • Safari
    • Opera
    • Mozilla Firefox
    SponsorBlock screenshot 1
    SponsorBlock screenshot 1
  12. Returns the ability to see dislike statistics on YouTube.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Online
    • Google Chrome
    • Mozilla Firefox
    • Tampermonkey
    Return YouTube Dislike screenshot 1
    Return YouTube Dislike screenshot 1
  13. Situational/Non-essential

  14. "User Agent Switcher and Manager" spoofs browser's User-Agent string. This string is used by web servers to provide content to you. Based on your browser type and operating system, web servers might provide different HTML content (like a different styling or lower...

    Cost / License

    • Free
    • Open Source

    Platforms

    • Online
    • Google Chrome
    • Opera
    • Firefox
    User-Agent Switcher and Manager screenshot 1
  15. ClearURLs icon
     Like

    This extension will automatically remove tracking elements from URLs to help protect your privacy when browse through the Internet.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Google Chrome
    • Mozilla Firefox
    • Microsoft Edge
    ClearURLs screenshot 1
    ClearURLs screenshot 1
    ClearURLs screenshot 2
    +1
    ClearURLs screenshot 3
  16. We all make many online accounts, but most of them are linked to 1 or 2 of our email addresses. This means if just one account is hacked or tracked, every other account and its associated data is now also at risk.

    Cost / License

    • Freemium
    • Open Source

    Platforms

    • Online
    • Google Chrome
    • Mozilla Firefox
    Firefox Relay screenshot 1
    Firefox Relay screenshot 1
    Firefox Relay screenshot 2
  17. Store bookmarks with related content, organize thematically with real-time collaboration and privacy focus, offering web clipper and cloud sync.

    Cost / License

    • Freemium
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Microsoft Edge
    • Vivaldi
    • Google Chrome
    • Safari
    • Yandex Browser
    • Software as a Service (SaaS)
    • Opera
    • Mozilla Firefox
    Raindrop.io interface with dark theme selected
    service description (Snapshot from homepage)
    (Snapshot from homepage)
    +5
    organize feature description (Snapshot from homepage)
  18. Zotero icon
     Like

    Zotero is a free, easy-to-use tool to help you collect, organize, share research and cite your research sources directly in your favourite word processor, with 300 MB free online storage.

    Cost / License

    • Freemium
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Microsoft Edge
    • Google Chrome
    • Safari
    • Microsoft Word
    • Google Docs
    • LibreOffice
    • Mozilla Firefox
    Zotero screenshot 1
    Zotero screenshot 1
    Zotero screenshot 2
    +2
    Zotero screenshot 3
  19. Web Archives is a browser extension that enables you to find archived and cached versions of web pages. Searches can be initiated from the context menu and the browser toolbar.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Microsoft Edge
    • Google Chrome
    • Safari
    • Opera
    • Firefox
    Web Archives screenshot 1
    Web Archives screenshot 1
    Web Archives screenshot 2
    +1
    Web Archives screenshot 3
  20. With the power of the Wayback Machine, you can go back in time to see how a website has changed and evolved through the history of the Web.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Google Chrome
    • Safari
    • Mozilla Firefox
    Wayback Machine screenshot 1
    Wayback Machine screenshot 1
    Wayback Machine screenshot 2
    +3
    Wayback Machine screenshot 3
  21. DownThemAll (or just dTa) is a powerful yet easy-to-use browser extension for Firefox, Chrome and Opera that adds new advanced download capabilities to your browser. DownThemAll lets you download all the links or images contained in a webpage and much more: you can refine your...

    Cost / License

    • Free
    • Open Source

    Platforms

    • Microsoft Edge
    • Google Chrome
    • Pale Moon
    • Mozilla Firefox
    DownThemAll screenshot 1
    DownThemAll screenshot 1
  22. SingleFile is an extension that helps you to archive a complete page into a single HTML file or HTM-File with Google Chrome and Chromium.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Microsoft Edge
    • Google Chrome
    • Safari
    • Mozilla Firefox
    SingleFile screenshot 1
    SingleFile screenshot 1
  23. Link Gopher is a simple extension to extract links from Mozilla Firefox. It extracts all links from web page (including embedded links), sorts them, removes duplicates, and displays them in a new tab for copy and paste into other systems.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Firefox
  24. ColorZilla is an extension for Mozilla Firefox and the Mozilla Suite.

    It assists web developers and graphic designers with color related tasks - both basic and advanced.

    With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and pa.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Online
    • Google Chrome
    • Firefox
    Eyedropper
    Color picker
    ColorZilla screenshot 2
  25. WhatFont icon
     Like

    WhatFont is a bookmarklet and Chrome extension that makes it easy to find out the fonts used in a webpage.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Google Chrome
    WhatFont screenshot 1
    WhatFont screenshot 1
  26. GIPHY icon
     Like

    Animated GIF platform with search, creation, sharing, animated stickers, pop culture content, clipboard support, and social media integration for reactions.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Online
    • Android
    • iPhone
    • Google Chrome
    • Mozilla Firefox
    GIPHY screenshot 1
    GIPHY screenshot 2
    GIPHY screenshot 3
  27. Metastream allows you to watch internet videos with friends. It synchronizes media on websites so you can watch together.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Chrome OS
    • Google Chrome
    • Mozilla Firefox
    Metastream screenshot 1
    Metastream screenshot 1
    Metastream screenshot 2
  28. BetterTTV icon
     Like

    Enhances Twitch with new features, emotes, and more.

    Cost / License

    • Freemium
    • Open Source

    Platforms

    • Microsoft Edge
    • Google Chrome
    • Safari
    • Opera
    • Twitch
    • Mozilla Firefox
    BetterTTV screenshot 1
    BetterTTV screenshot 1
    BetterTTV screenshot 2
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