Extensions by Weekly Downloads

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Xmarks Sync Requires Restart

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 (2,493)
6,057 weekly downloads

JavaScript Debugger Requires Restart

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

Rated 4 out of 5 stars (50)
6,040 weekly downloads

Lightbeam for Firefox Featured

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.

Rated 4 out of 5 stars (428)
6,038 weekly downloads

FireGestures Requires Restart Featured

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

Rated 4 out of 5 stars (873)
5,994 weekly downloads

Video Downloader Prime Compatible with Firefox 57+ Featured

Easily download most popular video formats.

Rated 4 out of 5 stars (64)
5,917 weekly downloads

Theme Font & Size Changer Featured

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.

Rated 5 out of 5 stars (170)
5,886 weekly downloads

Facebook Video Downloader Compatible with Firefox 57+

This extension adds a button to download every Facebook Video.

Rated 4 out of 5 stars (5)
5,864 weekly downloads

Dark YouTube Theme Compatible with Firefox 57+ Featured

Shut down the lights on YouTube.
Enjoy!

Rated 5 out of 5 stars (83)
5,791 weekly downloads

Strict Pop-up Blocker

Quickly toggle between blocking all pop-up windows and allowing some pop-ups

Rated 4 out of 5 stars (103)
5,729 weekly downloads

Torrent Tornado Requires Restart Featured

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

Rated 5 out of 5 stars (91)
5,676 weekly downloads

ColorZilla Compatible with Firefox 57+

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

Rated 4 out of 5 stars (376)
5,607 weekly downloads

Proxy Privacy Ruler

Restrict Proxy by Private Windows, Tabs and Domain List

Rated 5 out of 5 stars (18)
5,474 weekly downloads

Hide My IP Free

Hide Your IP Address and Unblock Websites for Free with the Hide My IP proxy and VPN IP network. Thousands of IPs around the world to choose from. Access your favorite streaming sites by changing your IP location. No ads or limitations.

Rated 3 out of 5 stars (24)
5,408 weekly downloads

YouTube™ Downloader Lite Compatible with Firefox 57+

A very lite YouTube downloader (FLV, WebM, 3GP, and MP4)

Rated 3 out of 5 stars (94)
5,404 weekly downloads

HTML5 Video Everywhere!

Replace video player with Firefox native video player

Rated 4 out of 5 stars (51)
5,313 weekly downloads

Selenium IDE Button Requires Restart

Just one simple toolbar button to open Selenium IDE. You need to have installed Selenium IDE: http://seleniumhq.org/projects/ide/

Rated 5 out of 5 stars (8)
5,295 weekly downloads

Media Converter and Muxer

Media Converter and Muxer is an easy to use video and audio converter and muxer.

Rated 3 out of 5 stars (33)
5,279 weekly downloads

Personas Plus

Personas (now known as lightweight themes) are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite themes.

Rated 3 out of 5 stars (853)
5,258 weekly downloads

Click&Clean Requires Restart

The quick and easy way to delete your browsing history, erase all temporary internet files, remove downloaded files history, cookies, Flash LSO, typed URLs. Allows to delete private data when Firefox closes. Supported ext. tools like CCleaner.

Rated 5 out of 5 stars (106)
5,251 weekly downloads

New Tab Override (browser.newtab.url replacement) Featured

This add-on brings back the ability to change the page which is shown when opening a new tab.

Rated 5 out of 5 stars (149)
5,155 weekly downloads