Mozilla Firefox Plugins, Add-ons and extension

Browse 1,756 Mozilla Firefox Plugins, Add-ons and extension on AlternativeTo.

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  1. Bitwarden icon
     1351 likes

    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
    216 alternatives
    4.8
    Excellent174 reviews
  2. Obsidian icon
     1087 likes

    Obsidian is a note-taking app that lets you create a personal knowledge graph with ease. It is designed for non-linear thinking and allows you to easily link your notes together wiki-style.

    Cost / License

    • Freemium
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Snapcraft
    • Microsoft Edge
    • Google Chrome
    • Flathub
    • Safari
    • Mozilla Firefox
    Obsidian screenshot 1
    Obsidian screenshot 1
    Obsidian screenshot 2
    +4
    Obsidian screenshot 3
    167 alternatives
    4.7
    Excellent168 reviews
  3. uBlock Origin icon
     1803 likes

    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

    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
    uBlock Origin screenshot 2
    +3
    uBlock Origin screenshot 3
    109 alternatives
    4.7
    Excellent107 reviews
  4. Joplin icon
     872 likes

    Open source note-taking app with Markdown support, to-do integration, and synchronization with cloud services like Dropbox and OneDrive.

    Cost / License

    • Freemium
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • AppImageHub
    • Snapcraft
    • Google Chrome
    • Flathub
    • PortableApps.com
    • F-Droid
    • Cloudron
    • Homebrew
    • Chocolatey
    • Termux
    • Mozilla Firefox
    Desktop and mobile apps
    Example
    Cli version!
    +3
    Table inside table with KaTeX Math notations.
(Live-editing with Vim)
    108 alternatives
    4.5
    Excellent133 reviews
  5. DuckDuckGo icon
     1554 likes

    Privacy-focused search engine offering Zero-click Info, instant answers, and more, built from open-source software for a user-friendly experience.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Microsoft Edge
    • Vivaldi
    • Google Chrome
    • Safari
    • F-Droid
    • Yandex Browser
    • Tor
    • Opera
    • Mozilla Firefox
    DuckDuckGo Homepage
    DuckDuckGo screenshot 1
    DuckDuckGo screenshot 2
    +16
    DuckDuckGo screenshot 3
    110 alternatives
    4.0
    Very Good83 reviews
  6. KeePassXC icon
     608 likes

    Open-source password manager storing passwords, notes, and attachments offline with AES-256 encryption, browser extensions, cross-platform support, and TOTP.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    • AppImageHub
    • Snapcraft
    • Microsoft Edge
    • Google Chrome
    • Flathub
    • PortableApps.com
    • Flatpak
    • Homebrew
    • Chocolatey
    • Mozilla Firefox
    Welcome Screen
    Unlock Database
    New Database Wizard
    +13
    New Database Wizard
    211 alternatives
    4.7
    Excellent75 reviews
  7. Proton VPN icon
     482 likes

    Swiss-based VPN that ensures online privacy with a high-speed network, advanced encryption, and no-logs policy, offering a free version. Supports multiple platforms and unblocks content worldwide.

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Google Chrome
    • Apple TV
    • Flathub
    • F-Droid
    • Android TV
    • Flatpak
    • Fire TV
    • Mozilla Firefox
    Proton VPN screenshot 1
    Proton VPN on Fedora
    Proton VPN screenshot 2
    +6
    Proton VPN screenshot 3
    233 alternatives
    4.5
    Excellent63 reviews
  8. Raindrop.io icon
     524 likes

    Store bookmarks with related content, organize thematically with real-time collaboration and privacy focus, offering web clipper and cloud sync.

    Cost / License

    • Freemium
    • Proprietary (MIT)

    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)
    179 alternatives
    4.2
    Very Good43 reviews
  9. MEGA icon
     922 likes

    Cloud-storage service with end-to-end encryption, selective synchronization, and shared folders without ads. Works offline and supports 2FA.

    Cost / License

    • Freemium
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • Windows Phone
    • iPad
    • Google Chrome
    • Mozilla Firefox
    MEGA screenshot 1
    MEGA screenshot 1
    MEGA screenshot 2
    +8
    MEGA screenshot 3
    202 alternatives
    3.6
    Good34 reviews
  10. Feedly icon
     1873 likes

    Organize and read content from RSS feeds into a magazine-like experience, simple sharing options, and seamless access across all devices.

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Google Chrome
    • Safari
    • Kindle Fire
    • Mozilla Firefox
    Feedly screenshot 1
    Feedly screenshot 1
    Feedly screenshot 2
    +7
    Feedly screenshot 3
    311 alternatives
    3.4
    Fair25 reviews
  11. VirusTotal icon
     516 likes

    Inspects files, domains, IPs, and URLs with 70+ scanners, sharing results with the security community. Free for end-users for non-commercial use.

    Cost / License

    • Free Personal
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Microsoft Edge
    • Google Chrome
    • Software as a Service (SaaS)
    • Mozilla Firefox
    Scan results for alternativeto.net
    the macOS/Linux desktop uploader
    the VT4Browsers Firefox extension
    +1
    Home
    45 alternatives
    4.5
    Excellent22 reviews
  12. Zotero icon
     476 likes

    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

    Application type

    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
    79 alternatives
    4.3
    Very Good23 reviews
  13. ActivityWatch icon
     555 likes

    Open-source app tracking time on devices, maintaining privacy and versatility, with features like productivity insights, Pomodoro timers, and local data storage.

    Cost / License

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • Android Tablet
    • Self-Hosted
    • Google Chrome
    • Rust
    • Python
    • Chromium
    • Mozilla Firefox
    ActivityWatch screenshot 1
    ActivityWatch screenshot 2
    ActivityWatch screenshot 3
    97 alternatives
    4.7
    Excellent74 reviews
  14. Adblock Plus icon
     1745 likes

    Adblock Plus is a free extension that allows you to - among other things - block annoying ads, disable tracking and block domains known to spread malware.

    Cost / License

    • Freemium
    • Open Source

    Application types

    Platforms

    • iPhone
    • Chrome OS
    • iPad
    • Microsoft Edge
    • Internet Explorer
    • Vivaldi
    • Google Chrome
    • Safari
    • Yandex Browser
    • Opera
    • Mozilla Firefox
    Adding a filter
    List of blockable items
    Blocking an image ad
    +3
    Adding a filter subscription
    120 alternatives
    2.7
    Poor26 reviews
  15. Mullvad Browser icon
     123 likes

    The Mullvad Browser is a privacy-focused web browser developed in a collaboration between Mullvad VPN and the Tor Project. It’s designed to minimize tracking and fingerprinting. You could say it’s a Tor Browser to use without the Tor Network.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    • Mozilla Firefox
    Mullvad Browser screenshot 1
    Mullvad Browser screenshot 1
    Mullvad Browser screenshot 2
    +1
    Mullvad Browser screenshot 3
    97 alternatives
    4.7
    Excellent27 reviews
  16. Wayback Machine icon
     322 likes

    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
    25 alternatives
    3.9
    Good14 reviews
  17. Proton Pass icon
     139 likes

    A password manager that ensures identity and password security with rigorous, end-to-end encryption, built by scientists from CERN, and recommended by the United Nations.

    Cost / License

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Google Chrome
    • Flathub
    • Safari
    • F-Droid
    • Mozilla Firefox
    • Snapcraft
    Proton Pass screenshot 1
    Proton Pass screenshot 1
    Proton Pass screenshot 2
    +3
    Proton Pass screenshot 3
    96 alternatives
    4.5
    Excellent26 reviews
  18. Startpage icon
     276 likes

    Privacy-focused search engine using Google results without trackers, storing no personal data, and offering Anonymous View for private browsing.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Google Chrome
    • Safari
    • Tor
    • Mozilla Firefox
    Dark theme
    Light theme
    Startpage screenshot 2
    +1
    Startpage screenshot 3
    103 alternatives
    3.5
    Good22 reviews
  19. LastPass icon
     1646 likes

    Online encrypted password storage with password generation, dark web monitoring, and two-factor authentication. Manage with security dashboard.

    Cost / License

    • Freemium
    • Proprietary

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • BSD
    • iPad
    • Microsoft Edge
    • Internet Explorer
    • Vivaldi
    • Google Chrome
    • Maxthon Cloud Browser
    • Opera
    • Mozilla Firefox
    LastPass screenshot 1
    LastPass screenshot 1
    LastPass screenshot 2
    +6
    LastPass screenshot 3
    228 alternatives
    2.6
    Poor45 reviews
  20. NextDNS icon
     149 likes

    NextDNS protects you from all kinds of security threats, blocks ads and trackers on websites and in apps and provides a safe and supervised Internet for kids — on all devices and on all networks.

    Cost / License

    • Freemium
    • Open Source (MIT)

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Chrome OS
    • BSD
    • iPad
    • UC Browser
    • Vivaldi
    • Google Chrome
    • UniFi Network
    • Safari
    • Yandex Browser
    • Software as a Service (SaaS)
    • OpenWrt
    • Opera
    • Alpine Linux
    • pfSense
    • Mozilla Firefox
    • DD-WRT
    NextDNS screenshot 1
    NextDNS screenshot 1
    NextDNS screenshot 2
    +11
    NextDNS screenshot 3
    139 alternatives
    4.6
    Excellent16 reviews
  21. AdGuard icon
     274 likes

    AdGuard is the best way to get rid of intrusive ads and online tracking, and to protect your computer from malware. Make your web surfing faster, safer and more comfortable with AdGuard!.

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Vivaldi
    • Google Chrome
    • Safari
    • Yandex Browser
    • Opera
    • Mozilla Firefox
    • Snapcraft
    • Microsoft Edge
    • Android TV
    AdGuard screenshot 1
    Very good app for blocking ads. Use it!
    AdGuard screenshot 2
    +4
    AdGuard screenshot 3
    121 alternatives
    4.3
    Very Good25 reviews
  22. SponsorBlock icon
     124 likes

    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

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Microsoft Edge
    • Google Chrome
    • Safari
    • Opera
    • Mozilla Firefox
    SponsorBlock screenshot 1
    SponsorBlock screenshot 1
    75 alternatives
    4.9
    Excellent21 reviews
  23. Inoreader icon
     1457 likes

    Aggregate RSS, newsletters, and social feeds with advanced filtering, real-time cross-device syncing, customizable reading views, and ad-free experience.

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Google Chrome
    • Safari
    • Kindle Fire
    • Opera
    • Mozilla Firefox
    Inoreader screenshot 1
    Inoreader screenshot 1
    Inoreader screenshot 2
    287 alternatives
    3.5
    Good31 reviews
  24. wallabag icon
     307 likes

    Open-source, self-hosted tool that extracts articles, offers offline mobile reading, powerful filters, migration from other services, and multiple download formats.

    Cost / License

    • Freemium
    • Open Source (MIT)

    Application type

    Platforms

    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • Google Chrome
    • Cloudron
    • Opera
    • Mozilla Firefox
    wallabag screenshot 1
    wallabag screenshot 1
    wallabag screenshot 2
    +4
    wallabag screenshot 3
    98 alternatives
    4.2
    Very Good12 reviews
  25. Privacy Badger icon
     315 likes

    Privacy Badger is a browser-add on tool that analyzes sites to detect and disallow content that tracks you in an objectionable, non-consensual manner. When you visit websites, your copy of Privacy Badger keeps note of the "third party" domains that embed images...

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Microsoft Edge
    • Google Chrome
    • Opera
    • Mozilla Firefox
    Overview of Privacy Badger extension
    66 alternatives
    4.7
    Excellent16 reviews