Mozilla Firefox Plugins, Add-ons and extension Page 21 of 74

Browse 1,830 Mozilla Firefox Plugins, Add-ons and extension on AlternativeTo including popular Mozilla Firefox options.

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  1. TwitchNoSub icon
     3 likes

    Be able to watch any sub-only vod on Twitch, integrated in the website and support every twitch features.

    Cost / License

    Platforms

    • Google Chrome
    • Twitch
    • Mozilla Firefox
    TwitchNoSub screenshot 1
    1 alternatives
  2. This add-on protects you from sites that automatically play loud/annoying sounds by muting all sites that aren't specified in a whitelist.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mozilla Firefox
    Mute Sites By Default screenshot 1
  3. heylogin icon
     3 likes

    heylogin is the first password manager with full hardware-based end-to-end encryption. 2-factor secure by default, developed and hosted in Germany.

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Online
    • Android
    • iPhone
    • iPad
    • Microsoft Edge
    • Google Chrome
    • Safari
    • Mozilla Firefox
    heylogin screenshot 1
    heylogin screenshot 1
    heylogin screenshot 2
    +3
    heylogin screenshot 3
    17 alternatives
  4. ekoru icon
     2 likes

    Search engine that fights climate change. 60% of revenue each month goes to climate change charities involved in animal welfare, reforestation, ocean conservation, and climate action.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Online
    • Google Chrome
    • Firefox
    ekoru screenshot 1
    ekoru screenshot 1
    ekoru screenshot 2
    +6
    ekoru screenshot 3
    66 alternatives
  5. Saladict icon
     8 likes

    Saladict is a professional inline translator browser extension, built for comparative reading, with comprehensive dictionaries covering all major languages.

    Cost / License

    • Free
    • Open Source (MIT)

    Platforms

    • Online
    • Chrome OS
    • Google Chrome
    • Firefox
    Saladict screenshot 1
    Saladict screenshot 1
    Saladict screenshot 2
    +4
    Saladict screenshot 3
    113 alternatives
  6. No, thanks. icon
     2 likes

    Browser extension that blocks newsletter pop-ups, Chat boxes, "Install our app" toolbars, "Allow notifications" pop-ups, Let us know your location" pop-ups, Survey and opinion pop-ups, Sticky video boxes in the corner and more.

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS
    • Google Chrome
    • Firefox
    11 alternatives
  7. Detect when your installed Chrome extensions have changed owners.

    Cost / License

    • Free
    • Open Source (MIT)

    Platforms

    • Google Chrome
    • Firefox
    Under New Management screenshot 1
  8. Enhanced Steam icon
     15 likes

    A Chrome and Firefox browser extension that enhances the Steam storefront with all kinds of extra information including price comparisons to other online retailers and the games historically lowest price.

    Cost / License

    • Free
    • Open Source

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS
    • Microsoft Edge
    • Google Chrome
    • Steam
    • Opera
    • Firefox
    Enhanced Steam screenshot 1
    Enhanced Steam screenshot 1
    Enhanced Steam screenshot 2
    +3
    Enhanced Steam screenshot 3
    4 alternatives
  9. Popup Blocker (strict) is a lightweight extension to prevent websites from opening popups. The extension pauses all sort of window opening requests for user attention. You can either accept or deny a request. Multiple unique requests are shown in an array.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • Google Chrome
    • Opera
    • Firefox
    Popup Blocker (strict) screenshot 1
    6 alternatives
  10. Dynamically load stylesheets in Firefox from plaintext files in your profile.

    superUserContent is a simple Firefox plugin that creates a new directory in your profile's chrome directory called userContent.css.d. You can use this directory as a runtime path for css styleshee.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Mozilla Firefox
    superUserContent screenshot 1
    8 alternatives
  11. CookieMaster icon
     1 like

    In a similar style to the old pre-WebExtensions CookieMonster plugin, CookieMaster allows you to control which sites are allowed to set cookies, focusing mainly on first party cookies.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mozilla Firefox
    CookieMaster screenshot 1
    CookieMaster screenshot 1
    CookieMaster screenshot 2
    1 alternatives
  12. InsensitiveX icon
     1 like

    This extension allows watching sensitive media on X (formely known as Twitter) for all accounts without providing a selfie or a government ID.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mozilla Firefox
    • Google Chrome
    InsensitiveX screenshot 1
  13. Shareaholic icon
     26 likes

    Shareaholic is the simplest way to share, spread, and save interesting webpages via your social networks, email, blogs, IM, and more.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Internet Explorer
    • Google Chrome
    • Safari
    • Songbird
    • Opera
    • Firefox
    Shareaholic screenshot 1
    Shareaholic screenshot 1
    15 alternatives
  14. mSecure icon
     6 likes

    mSecure keeps your data safe because it uses the ultra-secure 256bit blowfish encryption to protect personal information such as account numbers, usernames, passwords and more. mSecure is more than a password manager in that it provides 17 popular personal information templates...

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Google Chrome
    • Mozilla Firefox
    mSecure screenshot 1
    mSecure screenshot 1
    mSecure screenshot 2
    149 alternatives
  15. SearchLock icon
     8 likes

    SearchLock is a privacy-friendly search engine that prevents the tracking of your personal searches by the big search engine companies and others.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Google Chrome
    • Safari
    • Firefox
    SearchLock screenshot 1
    16 alternatives
  16. Displays new emails, sender's contact photo, and notifications, and allows the user to listen, read or delete emails without opening Gmail! Supports multiple accounts plus and provides many other tools.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Google Chrome
    • Firefox
    Checker Plus for Gmail screenshot 1
    Checker Plus for Gmail screenshot 1
    Checker Plus for Gmail screenshot 2
    16 alternatives
  17. On an internet dominated by ads and corporate-run websites, Indie Wiki Buddy is a browser extension that helps you easily find and support independent wikis.

    Cost / License

    • Free
    • Open Source (MIT)

    Platforms

    • Google Chrome
    • Firefox
    Indie Wiki Buddy screenshot 1
    Indie Wiki Buddy screenshot 1
    Indie Wiki Buddy screenshot 2
    +1
    Indie Wiki Buddy screenshot 3
    4 alternatives
  18. A browser extension that progressively immerses you in a language. Using Google Translate we translate frequent words in sites you read to a language you want to learn! This will not teach you a language but instead hopefully expand your vocab.

    Cost / License

    Application type

    Platforms

    • Google Chrome
    • Mozilla Firefox
  19. Hubql icon
     1 like

    The collaboration platform for building, documenting and testing APIs together.

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Online
    • Google Chrome
    • Software as a Service (SaaS)
    • Mozilla Firefox
    Hubql screenshot 1
    23 alternatives