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.
This places each day's entire browsing history in a submenu of the history menu.
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...
Webchunks is a Firefox3 implementation of Microsoft Webslices (feature appeared with IE8). It allows you to "follow" an area of a web page through a dedicated feed bookmarked in a new toolbar. Clicking on the toolbar entry shows the information relat...
Tabs Open Relative makes all new tabs open to the right of the current tab, rather than at the far right of the tab bar (optionally this only applies to links).
Firefox 3 lets you tag your bookmarks, but it doesn't give you a great way to browse your bookmarks by their tags. TagSifter tries to. Select a group of tags in the sidebar or menu, and TagSifter shows you all the related tags and bookmarks. Or searc...