Most Popular Extensions

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User Agent Switcher Featured

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

Rated 4 out of 5 stars (245)
373,450 users

iCloud Bookmarks No Restart

Keep your Firefox bookmarks on Windows up to date with your Safari bookmarks on iPhone, iPad, and Mac with the iCloud Bookmarks extension for Firefox.

Rated 2 out of 5 stars (88)
370,374 users

Easy Youtube Video Downloader Express No Restart

Only one with 1080p Full-HD and 192kbps 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.

Rated 4 out of 5 stars (552)
360,539 users

ImTranslator - Google Translator, Dictionary, TTS

MORE THAN 21 MILLION DOWNLOADS
ImTranslator provides translation powered by Google Translate, Microsoft, Babylon for 70+ languages. It includes Translator, Dictionary, Text-to-Speech, Back Translation.
Video Tutorial: http://youtu.be/qyLyFkQuMGU

Rated 4 out of 5 stars (434)
339,685 users

LastPass Password Manager Featured

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

Rated 4 out of 5 stars (1,212)
317,861 users

NoSquint Featured

NoSquint allows you to adjust the text-only and full-page (both text and images) zoom levels as well as color settings both globally (for all sites) and per site.

Rated 5 out of 5 stars (448)
314,682 users

Xmarks Sync

Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!

Rated 4 out of 5 stars (2,512)
306,655 users

YouTube Flash Player No Restart

A very lightweight add-on that forces YouTube™ to play videos using Flash® Player because it consumes less material resources (CPU, RAM) and offers more resolution choices than the HTML5 Player.

Rated 5 out of 5 stars (31)
306,086 users

FoxyProxy Standard Featured

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.

Rated 4 out of 5 stars (339)
303,695 users

ProxTube - Unblock YouTube No Restart

In some countries YouTube videos are blocked! Unblock them with this Addon.
Supported countries: Germany, Netherlands, Spain, ...? not US compatible
Status+Support: proxtube.com & Twitter: twitter.com/ProxTube (EN/DE)

Rated 4 out of 5 stars (221)
298,105 users

Blur Featured

Protect your Passwords, Payments, and Privacy.

Rated 3 out of 5 stars (669)
293,064 users

iMacros for Firefox Featured

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...

Rated 4 out of 5 stars (374)
287,307 users

Session Manager No Restart Featured

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.

Rated 4 out of 5 stars (549)
270,135 users

YouTube High Definition No Restart Featured

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.

Rated 5 out of 5 stars (192)
269,337 users

NetVideoHunter

This add-on is a downloader that lets you easily download videos from sites like Youtube, Facebook, Metacafe, Dailymotion, Break, VKontakte and music for example from SoundCloud, Grooveshark and from many other sites...

Rated 4 out of 5 stars (356)
265,155 users

IE Tab

IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...

Rated 4 out of 5 stars (1,185)
264,591 users

Webpage Screenshot in Firefox (♥♥♥♥♥)

FireShot Webpage Screenshots captures pages entirely. Demo: http://bit.ly/RlBQMV

Screenshots can be quickly captured and:

― Saved as Image or PDF
― Sent to clipboard
― Printed
― Annotated *
― Uploaded *
― E-Mailed *

* OS Windows only

Rated 5 out of 5 stars (427)
260,289 users

QuickJava Featured

Allows quick enable and disable of Java, Javascript, Cookies, Image Animations, Flash, Silverlight, Images, Stylesheets and Proxy from the Toolbar. This is great for increasing security or decreasing bandwidth.

Rated 5 out of 5 stars (249)
253,994 users

VKontakte.ru Downloader (music/videos/photos @ VK)

Download music, videos and photos from VK.com / vkontakte.ru. One-click download, natural filenames, displaying file size and bitrate for music, downloading HD video, downloading HQ photos. No spam, no usage of your account, no spyware.

Rated 5 out of 5 stars (412)
250,337 users

ColorZilla

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

Rated 5 out of 5 stars (300)
249,595 users