Killer Add-ons with extended/specific features for power users. If you are looking for themes or security addons you may then check Killer Themes or Security & Privacy Compilation.
Open Bookmarks/History/Homepage/URL/Search in new tabs, and more utilities for tabbed browsing. This is a lite version of Tab Utilities (http://addons.mozilla.org/addon/59961).
ArchiveFacebook is a free tool that allows you to save content from your Facebook account directly to your hard drive. Archive your photos, messages, activity stream, friends list, notes, events and groups.
Portable WYSIWYG editor! No matter what site you're visiting you can launch a WYSIWYG right in your browser.
Change your bookmark icons! Right-click a bookmark, and select "Properties", then "Browse" for a new image or paste in a URL.
An extension that allows for the use of dynamic commands in Firefox.
Provides thumbnail, progress meter, or others to each tab.
Generates magnet links for torrent sites, letting you pull the torrent out of the swarm without downloading it from the website
Collector's Note Since the install link its not avaliable you can get it from TorrenFreak http://torrentfreak.com/images/magnetiser.xpi
Note from Mozilla: This add-on has been discontinued. Try Colorlicious instead.
Change Firefox to Any Color and create your own personalized theme.
This sexy baby can transparently wrap ActiveX into the Plugins which supported by firefox. You can just link the media files(Wmplayer, Rmplayer, QtPlayer and FlashPlayer) as normally without security problems.
A nifty tool which allows you to clip out portions of webpages and reload them later to check for updates.
Are you looking at stuff you shouldn't be? Whether you are browsing through social networking sites while you're at work or wandering around MySpace while you're at school? Well this extension gives you the ability to close all tabs, while opening an...