TweakGuides.com posted Firefox 3.5 Tweak Guide
A quote from the article:
>> Firefox 3.5 Tweak Guide
I have revised the Firefox Tweak Guide for all the changes in Firefox 3.5. The guide not only contains descriptions of the new features, as well as all existing features, it has every major tips and tweak required to customize Firefox 3.5 to suit your needs and get the most out of this browser.
>> Firefox 3.5 Tweak Guide