I spent some time last week helping out a group of folks to get a Firefox extension up and running for Knowmore.org. It was a great experience - a testament to the power of distributed volunteer software development as well as how Firefox as a platform can enable such groups to rapidly build and deploy world-changing tools. As officially announced on Knowmore.org today, the extension is live! For screenshots and details, check out the wiki page, and you can install it here (still sandboxed, login is required).