It’s a free bibliographic management tool that works in Firefox. It collects and manages cites as you search

Zotero [zoh-TAIR-oh] is the next-generation research tool.

Features

• Automatically capture citations
• Remotely back up and sync your library
• Store PDFs, images, and web pages
• Cite from within Word and OpenOffice
• Take rich-text notes in any language
• Wide variety of import/export options
• Free, open source, and extensible
• Collaborate with group libraries