Featured Add-ons

by Mozilla

142 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 4,972 reviews

21,164,866 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).

Download YouTube Videos as MP4 by ialc

Rated 4 out of 5 stars 358 reviews

1,014,537 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 5 out of 5 stars 1,611 reviews

1,364,047 users

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

Ghostery by Ghostery

Rated 5 out of 5 stars 1,204 reviews

1,497,335 users

Enjoy a faster, safer and cleaner browsing experience.

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 957 reviews

1,260,853 users

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

NoScript Security Suite by Giorgio Maone

Rated 5 out of 5 stars 1,501 reviews

2,257,668 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.

YouTube Video and Audio Downloader by InBasic, Alopepeo

Rated 4 out of 5 stars 288 reviews

686,354 users

Downloads YouTube videos in all available formats (FLV, MP4, WebM, and 3GP) with video quality of your choice. It also contains a pure JavaScript library to extract the ORIGINAL audio file embedded in video files.

Adblock Plus Pop-up Addon by Jesse Hakanen

Rated 5 out of 5 stars 179 reviews

1,235,413 users

Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions.

ZenMate Security & Privacy VPN by ZenMate

Rated 4 out of 5 stars 135 reviews

201,049 users

Unblock the web and change your IP with 4 locations across the globe. ZenMate secures your browsing with encryption - protecting you from hackers, snoopers and data thieves who prey on unsecure connections.

S3.Google Translator by Oleksandr

Rated 5 out of 5 stars 234 reviews

277,051 users

S3.Google Translator adds the power of Google Translate’s automatic translations to your browser!
It supports translation of selected text, entered phrase or whole webpage between any of 80+ languages.

New Feature: Language learning!

FlashGot Mass Downloader by Giorgio Maone

Rated 5 out of 5 stars 498 reviews

941,626 users

Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.

iMacros for Firefox by iMacros

Rated 4 out of 5 stars 382 reviews

430,213 users

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...

Web of Trust, WOT: Website Reputation Ratings by WOT Services

Rated 3 out of 5 stars 1,638 reviews

1,051,094 users

Find out which websites you can trust. WOT adds intuitive traffic light-style icons next to search results and URLs so you can decide whether to visit a site:
• Green – The site is trusted
• Yellow – Be cautious
• Red – Online threats detected

LastPass Password Manager by LastPass, Andrew Zitnay

Rated 4 out of 5 stars 1,236 reviews

745,142 users

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

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 251 reviews

363,887 users

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
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