Featured Add-ons

by Mozilla

141 Add-ons in this Collection

Bluhell Firewall by Diego Casorran

Rated 5 out of 5 stars 243 reviews

135,955 users

Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.

Self-Destructing Cookies by Ove

Rated 4 out of 5 stars 436 reviews

181,367 users

Fix the web. Gets rid of a site's cookies and LocalStorage as soon as you close its tabs. Protects against trackers and zombie-cookies. Trustworthy services can be whitelisted.

Download Status Bar by Szalgiris

Rated 5 out of 5 stars 339 reviews

239,103 users

If you are the kind of person who likes to have total control over every aspect of your downloads, "Download Status Bar" is the add-on you are looking for.

Lightbeam for Firefox by Mozilla

Rated 4 out of 5 stars 408 reviews

606,007 users

Lightbeam is a Firefox add-on that enables you to see the first and third party sites you interact with on the Web. Using interactive visualizations, Lightbeam shows you the relationships between these third parties and the sites you visit.

Tamper Data by Adam Judson

Rated 4 out of 5 stars 133 reviews

103,834 users

Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...

YouTube ALL HTML5 by Klemens Schölhorn

Rated 4 out of 5 stars 142 reviews

119,676 users

Play all videos on youtube without flash in your preferred size using only HTML5.

FireGestures by Gomita

Rated 4 out of 5 stars 885 reviews

349,270 users

A customizable mouse gestures extension which enables to execute various commands and user scripts with six types of gestures.

YouTube Enhancer Plus by Maxime RF

Rated 5 out of 5 stars 100 reviews

85,033 users

One of the best YouTube™ add-ons for Firefox! Ad Blocker, Autoplay Manager, Auto HD, Auto Replay, Cinema Mode, and more.

Session Manager by Michael Kraft

Rated 5 out of 5 stars 436 reviews

274,673 users

Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.

Webmail Ad Blocker by Jason

Rated 4 out of 5 stars 188 reviews

124,715 users

Expand your email area by blocking and removing ads on the right hand side of the screen when using Gmail, Hotmail, Outlook.com and Yahoo Mail.

Nimbus Screen Capture - editable screenshots by pos1t1ve

Rated 5 out of 5 stars 188 reviews

103,187 users

1) Screen capture web pages.
2) Selected regions.
3) Whole browser windows.
Edit screenshots and save the images to either local file or Google Drive. Annotate screenshots in a very user-friendly interface with different tools. Upload and share!

Torrent Tornado by Oleksandr

Rated 4 out of 5 stars 55 reviews

35,418 users

A Torrent Client for Firefox and SeaMonkey, runs everywhere, created in pure JavaScript without binary software!

User-Agent Switcher by Linder

Rated 4 out of 5 stars 11 reviews

29,438 users

Quickly and easily switch between popular user-agent strings.

Theme Font & Size Changer by Baris Derin, Access Firefox Project

Rated 5 out of 5 stars 153 reviews

89,530 users

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Blur by Abine, Inc., the online privacy company

Rated 3 out of 5 stars 717 reviews

236,696 users

Protect your Passwords, Payments, and Privacy.
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