We invite you to help turn the open Web into a rich learning environment and explore new possibilities for learning online as part of the Jetpack for Learning Design Challenge, sponsored by the Mozilla Foundation with support from the John D. and Catherine T. MacArthur Foundation.

Page Speed is an open-source Firefox/Firebug Add-on. Webmasters and web developers can use Page Speed to evaluate the performance of their web pages and to get suggestions on how to improve them. From Google Code.

an API for allowing you to write Firefox add-ons using the web technologies you already know.

process of reverse-discovery. from sitepoint.

an introduction to firefox extension development.

free, open source screen reader extension for firefox.

an experiment into connecting the web with language. from mozilla labs.

a firefox extension that finds unused css selectors.