Most Popular Extensions
Now with 1080p Full-HD Support!
Download every YouTube video you want and you can download them as Full-HD MP4, FLV, 3GP, MP3 128kbps and 256kbps, M4A and AAC formats. Also thumbnails and subtitles can be downloaded! Easy and Fast!
Print Edit Requires Restart Featured
Allows editing of web page content while in Print Preview mode, prior to printing or saving as HTML or PDF. Compacts the layout and removes unwanted content such as adverts, sidebars and blank pages. Any element can be formatted, hidden or deleted.
Youtube Downloader 4K - Video Downloader Requires Restart
Download from YouTube 4K videos and thousands other video websites.
Modify Headers Requires Restart
Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.
Selenium IDE Requires Restart
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.
Add-ons Manager Context Menu Requires Restart
Add more items to Add-ons Manager context menu.
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Text Link Requires Restart
Allows URI texts written in webpages to be loaded by double clicks.
Empty Cache Button Requires Restart
Cache clearing made easy. One click.
Quickly toggle between blocking all pop-up windows and allowing some pop-ups
Download and save videos playing on a website like youtube to your hard disk
Youtube MP3 Podcaster Requires Restart
Self contained add-on for downloading youtube videos to mp3 for easy listening on podcasting gadgets like a Zune or iPod
Play all videos on YouTube with your preferred settings (size, quality, playback rate, …) without cookies using only HTML5.
View JSON documents in the browser.
ChatZilla Requires Restart
A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.
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.
Bring your bookmarks into view with just a gesture. Move the sidebar across the screen. Open a different sidebar by just clicking its title. And more! Keeps your sidebar simple and quick to access!
Tab Scope Requires Restart Featured
Preview and navigate tab contents through popup.
Cookies Manager+ Requires Restart
Cookies manager to view, edit and create new cookies. It also shows extra information about cookies, allows edit multiple cookies at once and backup/restore them.