Download Zotero and associated plug-ins using these links:
Zotero is a free, open source, easy-to-use Firefox add-on (and now works with Chrome and Safari) that helps you to collect, manage, cite, and share your research sources. It lives right where you do your work - in your web browser. Designed to be intuitive and unobtrusive (it looks a lot like an iTunes library), Zotero is a powerful and handy tool for any academic.
Zotero works on all three major operating systems: PC, Mac, and Linux. Please note that Zotero does NOT work with the Microsoft Explorer web browser.
Check out the Zotero support site for for assistance.