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.
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).
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...