Featured Add-ons

by Mozilla

94 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 4,954 reviews

19,192,223 users

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

uBlock Origin by Raymond Hill

Rated 5 out of 5 stars 833 reviews

2,956,978 users

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

YouTube High Definition by Baris Derin

Rated 5 out of 5 stars 236 reviews

428,816 users

YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.

Download YouTube Videos as MP4 by ialc

Rated 4 out of 5 stars 452 reviews

1,052,535 users

An extension that adds direct links to download YouTube videos as MP4 and FLV. It has a simple interface and it downloads videos directly from YouTube. The extension integrates with YouTube's interface and adds a download button below the player.

DownThemAll! by Nils Maier, Federico Parodi, others

Rated 4 out of 5 stars 1,831 reviews

1,194,875 users

The first and only download manager/accelerator built inside Firefox!

NoScript Security Suite by Giorgio Maone

Rated 5 out of 5 stars 1,623 reviews

2,172,979 users

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 and Clickjacking attacks.

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,017 reviews

1,169,615 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Ghostery by Ghostery

Rated 5 out of 5 stars 1,346 reviews

1,371,175 users

Increase your browsing privacy, protection, and speed.

iMacros for Firefox by Ipswitch

Rated 4 out of 5 stars 436 reviews

1,372,029 users

Automate Firefox. Record and replay repetitive tasks. If you're tired of manually visiting the same sites, filling out forms, downloading files and extracting data, then iMacros is for you! Save time, effort and money with iMacros browser automation!

Emoji Keyboard by Harry N.

Rated 5 out of 5 stars 44 reviews

22,767 users

A free extension of the web tools https://emojikeyboard.org. It helps input emoji in the browser with an extensive search functionality to facilitate getting emoji by keywords.

OmniSidebar by Quicksaver

Rated 5 out of 5 stars 110 reviews

102,191 users

Bring your bookmarks into view with just a gesture. Move the sidebar across the screen. Open a different sidebar by just clicking its title. And more! Keeps your sidebar simple and quick to access!

HTTPS Everywhere by EFF Technologists

Rated 4 out of 5 stars 126 reviews

306,913 users

Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.

AdBlocker for YouTube™ by AdblockLite

Rated 4 out of 5 stars 37 reviews

326,963 users

AdBlocker for YouTube™ removes all annoying Ads from YouTube

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 985 reviews

431,931 users

FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.

Check out my new project, FireSSH!

FoxyProxy Standard by Eric H. Jung, groeg, others

Rated 4 out of 5 stars 366 reviews

260,207 users

FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.
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