Most Popular Extensions
Screengrab (fix version) Featured
Screengrab! saves webpages as images.
New features: upload to internet
Status bar widgets and progress indicators for Firefox 4+
Download from YouTube 4K videos and thousands other video websites.
Allows URI texts written in webpages to be loaded by double clicks.
A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.
Nimbus Screen Capture - editable screenshots No Restart Featured
1) Screen capture web pages.
2) Selected regions.
3) Whole browser windows.
Edit screenshots and save the images to either local file or Google Drive. Annotate screenshots in a very user-friendly interface with different tools. Upload and share!
McAfee Security Scan Plus detection No Restart
This extension allows Adobe installers to detect McAfee Security Scan Plus software is installed on your PC.
Tab Scope Featured
Preview and navigate tab contents through popup.
New Tab Homepage No Restart
A very simple tabbed browsing extension that loads your homepage when you open a new tab. If you have multiple homepages, the first is chosen.
Youtube and more – Easy Video Downloader No Restart
Download and save videos playing on a website like youtube to your hard disk
DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
Bluhell Firewall No Restart Featured
Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.
Now with 1080p Full-HD Support!
Direct YouTube downloads MP3 M4A AAC and HD MP4, FLV, 3GP. With just one mouse click! With the click off an mouse button! Super fast downloads right from the Youtube video page you are viewing.
DuckDuckGo Plus No Restart Featured
DuckDuckGo is the search engine that doesn't track you. We also have smarter answers and less clutter. This extension makes DuckDuckGo available in the address bar, search bar and right-click menu. Also adds a handy toolbar button with more features!
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.
Read EPUB e-books and browse OPDS catalogs.
Self contained add-on for downloading youtube videos to mp3 for easy listening on podcasting gadgets like a Zune or iPod
Print Edit 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.
JSONView No Restart
View JSON documents in the browser.
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.