Please be aware however that auto-updating is not yet implemented, so if you want to keep up with changes to the extension you’ll have to subscribe to the blog, or keep an eye on that page until it is. Once I have auto-updating sorted I’ll put the extension on http://addons.mozilla.org.
I want to thank Steve Souders for his work on YSlow. His documentation in the YSlow code was one of the major things that helped me get this project as far as it is. I hope to help continue improving the rather abysmal state of Firebug documentation so other people can create more extensions to what is one of my favourite web development tools.