Featured Add-ons

by Mozilla

124 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 5,659 reviews

13,515,321 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 2,192 reviews

3,681,621 users

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

Privacy Badger by EFF Technologists

Protects your privacy by blocking spying ads and invisible trackers.

AdBlock for Firefox by AdBlock

The most popular ad blocker for Chrome and Safari, now available for Firefox! Block all advertisements on all web pages, even Facebook, Youtube, and Hulu. Browse faster, too! Most ads aren't even downloaded at all, saving you time and bandwidth.

Enhancer for YouTube™ by Maxime RF

Tons of features to improve your user experience on YouTube™.

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,159 reviews

864,202 users

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

DownThemAll! by Nils Maier, Federico Parodi, others

Rated 4 out of 5 stars 1,806 reviews

919,989 users

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

NoScript Security Suite by Giorgio Maone

Rated 5 out of 5 stars 1,585 reviews

1,756,796 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.

Awesome Screenshot Plus - Capture, Annotate & More by Diigo Inc.

Rated 4 out of 5 stars 1,567 reviews

409,651 users

Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, blur sensitive info, one-click upload to share. And more!

iMacros for Firefox by Ipswitch, Inc.

Rated 4 out of 5 stars 526 reviews

1,279,178 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!

AdBlocker Ultimate by AdBlocker Ultimate

Rated 5 out of 5 stars 2,140 reviews

355,369 users

Free and improved ad blocker. Completely remove ALL ads. No "acceptable" ads or whitelisted advertisers, block tracking, block malware!

LanguageTool Grammar Checker by Daniel Naber

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.

Ghostery by Ghostery

Rated 4 out of 5 stars 1,517 reviews

938,078 users

Increase your browsing privacy, protection, and speed.

Easy Youtube Video Downloader Express by Dishita

Rated 4 out of 5 stars 1,263 reviews

212,349 users

"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.

Grammarly for Firefox by Grammarly

Rated 4 out of 5 stars 211 reviews

361,339 users

Grammarly will help you communicate more effectively. As you type, Grammarly flags mistakes and helps you make sure your messages, documents, and social media posts are clear, mistake-free, and impactful.
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