Extensions are like apps for your browser.

They add features to Firefox to make browsing faster, smarter, or just plain fun.

Recommended 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.

    48,375 users

  • Download Manager (S3)

    Download Manager (S3)

    View and manage downloads from a tidy status bar This is a new life in Firefox 26+ for old well-known addon Download Statusbar New Features: Replace Downloads Library page. Now you have full control of your downloads history!

    73,981 users

  • Easy Youtube Video Downloader Express

    Easy Youtube Video Downloader Express

    WORKS WITH NEW YOUTUBE LAYOUT, "Best Youtube Video Downloader", Only one with 1080p Full-HD and 256kbps MP3 Direct Links. A clean, fast and simple addon for superfast and easy downloads in FLV, 3GP, MP3, MP4, 720p, 1080p qualities on Youtube pages.

    416,782 users

  • Popup Blocker (strict)

    Popup Blocker (strict)

    Strictly block all popup requests from any website by default. A notification window is opened to allow you accept, reject, open the popup in background page, or redirect the current page to popup address

    33,070 users

Popular themes
Enhanced privacy extensions
  • Privacy Badger

    Privacy Badger

    Automatically learns to block invisible trackers.

    616,855 users

  • Decentraleyes

    Decentraleyes

    Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.

    188,897 users

  • Facebook Container

    Facebook Container

    Prevent Facebook from tracking you around the web. The Facebook Container extension for Firefox helps you take control and isolate your web activity from Facebook.

    667,051 users

  • Disconnect

    Disconnect

    Make the web faster, more private, and more secure.

    175,169 users

Popular extensions
  • uBlock Origin

    uBlock Origin

    Finally, an efficient blocker. Easy on CPU and memory.

    4,694,207 users

  • Video DownloadHelper

    Video DownloadHelper

    The easy way to download and convert Web videos from hundreds of YouTube-like sites.

    2,592,411 users

  • NoScript Security Suite

    NoScript Security Suite

    The best security you can get in a web browser! Allow active content to run only from sites you trust, and protect yourself against XSS other web security exploits. Disabled and can't reinstall? https://tinyurl.com/moz-ext-cert

    1,524,129 users

  • LastPass Password Manager

    LastPass Password Manager

    LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

    864,554 users

Recommended themes
Recommended password managers
  • LastPass Password Manager

    LastPass Password Manager

    LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

    864,554 users

  • Bitwarden - Free Password Manager

    Bitwarden - Free Password Manager

    A secure and free password manager for all of your devices.

    118,932 users

  • 1Password X – Password Manager

    1Password X – Password Manager

    The best way to experience 1Password in your browser. Easily sign in to sites, generate passwords, and store secure information, including logins, credit cards, notes, and more.

    45,184 users

  • RoboForm Password Manager

    RoboForm Password Manager

    RoboForm, the #1 ranked Password Manager makes your life easier by remembering passwords and logging you into websites automatically

    87,250 users