Mozilla Firefox Plugins, Add-ons and extension Page 44 of 72

Browse 1,793 Mozilla Firefox Plugins, Add-ons and extension on AlternativeTo.

Copy a direct link to this comment to your clipboard
  1. SyncPlaces icon
     4 likes

    SyncPlaces is a Firefox extension that allows you to synchronise your bookmarks and passwords between different installations of Firefox (e.g. a browser at Home and another at Work). It only works with Firefox v3 and above (but is compatible with older bookmark extensions).

    Cost / License

    • Free
    • Proprietary

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Firefox
    SyncPlaces screenshot 1
    SyncPlaces screenshot 1
    SyncPlaces screenshot 2
    +1
    SyncPlaces screenshot 3
    6 alternatives
  2. Obfuscate icon
     Like

    Sometimes you might want to share a screenshot of the website you're on, without revealing the personal data that is visible at that time. With Obfuscate, you can make text unreadable without changing the structure of the web page.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Firefox
    Obfuscate screenshot 1
    Obfuscate screenshot 1
  3. nuTensor icon
     2 likes

    An fork of uMatrix. It features the same point & click system that forbids/allows any class of requests made by your browser. Same as uMatrix use it to block scripts, iframes, ads, facebook, etc. Currently in early development, only Firefox for now.

    Cost / License

    Application type

    Alerts

    • Discontinued

    Platforms

    • Online
    • Firefox
    14 alternatives
  4. ShopToList icon
     3 likes

    A universal wishlist, think Pocket, but for Shopping. Add a product you want to buy, get notifications if the price drops.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Online
    • Google Chrome
    • Safari
    • Firefox
    ShopToList screenshot 1
    10 alternatives
  5. Postcron icon
     18 likes

    Save time and effort scheduling your posts on Facebook, Twitter, LinkedIn, Pinterest, Google Plus, and Instagram, at the same time.

    Cost / License

    • Paid
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Google Chrome
    • Safari
    • Firefox
    Postcron screenshot 1
    Postcron screenshot 1
    Postcron screenshot 2
    +1
    Postcron screenshot 3
    79 alternatives
  6. ThumbNew icon
     1 like

    ThumbNew is an AI-powered tool that automatically creates YouTube thumbnails. Simply provide a prompt, and it handles everything:

    Cost / License

    • Freemium
    • Proprietary

    Platforms

    • Online
    • Mozilla Firefox
    • Windows
    • Android
    • Software as a Service (SaaS)
    • Self-Hosted
    • Google Chrome
    Preview
    Generated_Thumbnail
    Generated_Thumbnail
    +3
    Generated_Thumbnail
  7. With this extension, you can customize smooth scrolling behavior.

    The extension is worth to use, if you are frustrated at:

    Step size for scrolling by the cursor keys is so short. A built-in smooth scrolling is somewhat less sensitive and laggy. When you flick a wheel so quick.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Firefox
    8 alternatives
  8. PdfIt icon
     3 likes

    The Pdf It! extension is designed for FireFox and runs on any platform: Windows, Mac OS X and Linux. The Pdf It! menu item will be installed at Browser-->Tools menu as well as context menu

    Cost / License

    • Free
    • Proprietary

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Firefox
    PdfIt screenshot 1
    59 alternatives
  9. Hiddenpost icon
     4 likes

    Many websites contain secret messages and comments. Imagine you could make these messages visible or even add your own. Now imagine that this function would exist everywhere and only the users themselves would have control over it. Wouldn't that be great?

    Cost / License

    • Free
    • Proprietary

    Application type

    Alerts

    • Discontinued

    Platforms

    • Firefox
    Add comment to any website.
    Select emotion icon for your post.
    32 alternatives
  10. LinCV icon
     2 likes

    LinCV can transform your LinkedIn profile data to a beautiful printable CV with two clicks. You can also add reference data and more detailed contact information.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS
    • Vivaldi Browser
    • Google Chrome
    • Brave
    • Firefox
    LinCV screenshot 1
    3 alternatives
  11. Proofread Bot icon
     5 likes

    Proofread Bot checks your writing for grammar, style, spelling, statistic and plagiarism issues and gives recommendations to improve your writing. The tool gives you a visual text editing interface and an auto generated textual report for your convenience.

    Cost / License

    • Freemium
    • Proprietary

    Platforms

    • Online
    • Android
    • Google Chrome
    • Drupal
    • Google Drive - Docs
    • Facebook
    • Wordpress
    • Microsoft Office Suite
    • Firefox
    Proofread Bot screenshot 1
    Proofread Bot screenshot 1
    Proofread Bot screenshot 2
    56 alternatives
  12. MySessions icon
     2 likes

    MySessions is a simple session manager. You can quickly save your current browser state and reload it whenever necessary.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Firefox
    MySessions screenshot 1
    MySessions screenshot 1
    MySessions screenshot 2
    +1
    MySessions screenshot 3
    22 alternatives
  13. keyconfig icon
     2 likes

    keyconfig allows you to change keyboard shortcuts. [Firefox, Thunderbird, SeaMonkey, and any other XULRunner Application]

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Thunderbird
    • SeaMonkey
    • Firefox
  14. Unofficial ProtonMail extension. Provides notifications and makes it possible to close the ProtonMail tab, and even the browser, without getting logged out.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Online
    • ProtonMail
    • Google Chrome
    • Firefox
    ProtonMail Extension screenshot 1
    ProtonMail Extension screenshot 1
    ProtonMail Extension screenshot 2
    +2
    ProtonMail Extension screenshot 3
    4 alternatives
  15. Negotiator icon
     2 likes

    Negotiator is a web extension which gives users who are familiar with HTTP requests the tool to simply block and modify them permanently.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • BSD
    • iPad
    • Google Chrome
    • Haiku
    • Firefox
    Negotiator screenshot 1
    Options page including. Sync options(local and "Negotiator Sync") Default actions. Customization of filters.
    Full list of your filters. Note that no filters comes by default - you must define all by yourself.
    15 alternatives
  16. Pagetual icon
     4 likes

    Most powerful auto pager script to fetch the next page automatically for infinity scroll, popular userscripts of Greasemonkey/Tampermonkey addon/extension. Support Firefox/Chrome/Safari /Edge/iOS/Android. Essential efficiency tool.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Android
    • iPhone
    • Google Chrome
    • Mozilla Firefox
    Pagetual screenshot 1
    4 alternatives
  17. WebSpellChecker offers a portfolio of multilingual sentence check solutions for dev companies, businesses, and individuals, WProofreader SDK, WProofreader browser extension, SCAYT plugin for CKEditor 4, WProofreader plugin for WordPress.

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Windows
    • Linux
    • Online
    • Self-Hosted
    • Google Chrome
    • CKEditor
    • Froala Editor
    • TinyMCE
    • Software as a Service (SaaS)
    • Wordpress
    • Firefox
    WProofreader text checker UI
    WProofreader HTTP API
    WProofreader browser extension
    +2
    WProofreader admin panel — Settings
    29 alternatives
  18. Slickplan icon
     2 likes

    Slickplan brings order to complex website projects for teams and agencies, combining visual sitemaps, user flow diagrams, content planning & design reviews in one hub for faster launches, fewer revisions & seamless collaboration from concept to CMS-ready deliverables.

    Cost / License

    • Paid
    • Proprietary

    Platforms

    • Online
    • Software as a Service (SaaS)
    • Mozilla Firefox
    • Google Chrome
    • Wordpress
    Slickplan screenshot 1
    Slickplan screenshot 1
    Slickplan screenshot 2
    +10
    Slickplan screenshot 3
    9 alternatives
  19. Search Site icon
     2 likes

    This extension makes it possible to search within the current site from popup menu or searchbar using the default search engine. Customized for such search engines as Google, Yandex, Rambler, Bing, Baidu, AOL and others.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Firefox
    Search Site screenshot 1
    2 alternatives
  20. nuu icon
     3 likes

    NUU is to be an open-source (massive) multiplayer game of space trade and combat. NUU is heavily inspired by Ambrosia Software's Escape Velocity. It's excellent open-source cousin naev currently lends NUU it's assets.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Google Chrome
    • Node.JS
    • Chromium
    • Firefox
    nuu screenshot 1
    5 alternatives
  21. HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing. The details of the errors are seen when looking the HTML source of the page.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Firefox
    HTML Validator screenshot 1
    6 alternatives
  22. Video4sure icon
     11 likes

    With group calls up to 256 users, Video4sure is an easy way to make video calls or setup group meetings. No need to register, install or pay. As soon as you visit the home page, it generates a unique invite link that you can share with your contacts.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Online
    • iPhone
    • Google Chrome
    • Opera
    • Firefox
    39 alternatives
  23. RedditVideodl.com allows you to download Reddit videos with Sound in HD Formats. Powerful & free Reddit video downloader to save/download videos from Reddit.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Online
    • Google Chrome
    • Firefox
    RedditVideodl.com screenshot 1
    RedditVideodl.com screenshot 1
    RedditVideodl.com screenshot 2
    +1
    RedditVideodl.com screenshot 3
    10 alternatives
  24. Qualys BrowserCheck is a free tool that scans your browser and its plugins to find potential vulnerabilities and security holes and help you fix them. This tool will also help you fix the security issues discovered by the scan.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Firefox
    Install plugin
    Issues detected
    Up to date
    3 alternatives