In this session we'll assume that you already know or can find out the basic method of Firefox extension development, and will show you how to go further using XPCOM, overlays, XHRs, DOM manipulation, etc. in order to make Firefox do things you might have never thought possible. We'll present a selection of cool tricks and explain how they were accomplished, as well as teaching you where to look for the documentation to go further on your own.

Tutorial Files:
design-challenge.mozilla.com/spring09/files/extension_hacks_tutorial.zip

More videos from the Mozilla Labs Design Challenge - Spring 09:
vimeo.com/channels/designchallenge