Zotero - The Next-Generation Research Tool
Zotero [zoh-TAIR-oh] is a free, easy-to-use Firefox extension to help you collect, manage, and cite your research sources. It lives right where you do your work — in the web browser itself.
33′ Rockers | 13 Great Firefox Extensions for Web Professionals
Tab Mix Plus :: Mozilla Add-ons :: Add Features to Mozilla Software
Firefox Extension Guide
CERIAS Weblogs » Useful Firefox Security Extensions
Mozilla’s Firefox browser claims to provide a safer browsing experience out of the box, but some of the best security features of Firefox are only available as extensions. Here’s a roundup of some of the more useful ones I’ve found.