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Wiktionary and Google Translate

(former Google Dictionary and Google Translate)

In-line dictionary for any word you point to or double-click; whole page translation of any web page in another language.

Rated 4 out of 5 stars (127)
60,245 users

SmoothWheel Featured

Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).

Rated 5 out of 5 stars (226)
58,982 users

F.B. Purity - Cleans Up Facebook No Restart Featured

F.B. Purity hides the ads, app spam and other annoying clutter from your facebook news feed, lets you increase the font size, change colours plus many more features and generally makes Facebook a lot less annoying to use.

Rated 5 out of 5 stars (51)
55,924 users

Multifox No Restart Featured

Multifox is an extension that allows Firefox to connect to websites using different user names. Simultaneously!

Rated 4 out of 5 stars (37)
55,087 users

MaskMe: Online Privacy Protection

Stop giving away your personal information online by creating disposable email addresses, phone numbers, and credit cards with MaskMe. Websites don't need your personal info, and now you don't have to give it to them. MaskMe is free!

Rated 4 out of 5 stars (93)
53,862 users

Youtube to MP3 Converter - High Quality MP3 it

Youtube to MP3 Converter which places an "MP3 it" Button on Youtube Video Pages.

With Just One Click, A New Tab Loads without Disruption of your viewing Experience Where you can Downloaded your Converted 256k MP3 File.

Rated 2 out of 5 stars (25)
51,949 users

gTranslator

Google translate gadget for firefox. This extension translates entire webpages into a language of your choice with one click. Idea comes from Google Translation Bar for Chrome.

Rated 4 out of 5 stars (129)
50,226 users

Capture & Print No Restart Featured

This add-on lets you print a webpage's area easily.

Rated 5 out of 5 stars (34)
46,962 users

Topface. Meeting is easy No Restart

Extension for Topface new messages notifications.

Rated 2 out of 5 stars (4)
46,932 users

Gmail Twitter & Facebook Signature - WiseStamp

Using Gmail? Google mail? Yahoo? Hotmail or Thunderbird? Empower your email with your Twitter, Facebook, LinkedIn, Youtube, eBay item and many more apps...Create a powerful & effective email signature that dose the job ☛ Get it now!

Rated 4 out of 5 stars (281)
46,577 users

FB Phishing Protector No Restart Featured

Protects you from Phishing or Scams (through XSS injection attacks) while you're on Facebook™ - Version 4.2 introduces a Tracking Protection feature as well.

Rated 5 out of 5 stars (16)
42,519 users

Twoo No Restart

You'll only ever be one click away from the latest news on Twoo, the world's friendliest social discovery platform.

Rated 5 out of 5 stars (6)
39,905 users

Facebook Photo Zoom

Facebook Photo Zoom lets you zoom Facebook images.

Rated 5 out of 5 stars (14)
39,881 users

Pearltrees No Restart Featured

A place to collect, organize and share everything you like on the web

Rated 5 out of 5 stars (232)
38,039 users

MP3 Download

MP3 Download - Download best MP3 from the world's most advanced MP3 Search engine.

Rated 3 out of 5 stars (15)
38,009 users

HTML Desktop Notifications

Extension to add desktop notifications into firefox, the way it works with Chrome and Chromium Browser : works with gmail, gtalk (gmail chat), imo.im, and all other websites that use this technology.

Rated 4 out of 5 stars (49)
37,867 users

rollApp File Opener No Restart

Cloud-based add-on that turns your browser into a universal file viewer. Open 500+ file types with Firefox. Anywhere. Anytime.

Rated 4 out of 5 stars (11)
36,726 users

Anti-Porn Pro - The web porn filter addon!

Cloudacl WebFilter is cloud based porn content filtering application monitoring millions web sites and billion of web pages to keep you family especially your kids away from sex, nudity and adult content.

Rated 4 out of 5 stars (33)
36,452 users

WebDAV Launcher

The plugin is used by Atlassian's Confluence to launch Microsoft Office files for editing directly from Firefox.
Note that this plugin is meant to be used in conjunction with Confluence.

Rated 2 out of 5 stars (8)
36,420 users

Imgur Uploader Featured

Imgur Uploader allows you to easily upload images that you stumble across on the web to Imgur, via a simple right click menu. It also allows you to share them out to your favorite social media sites instantly, and upload screenshots of webpages.

Rated 4 out of 5 stars (89)
33,666 users