Firefox Tweak Guide
The TechSpot.com site provides a very practical Firefox Tweak Guide. Includes such useful tips as how to back up and restore Profiles. From my own experimental install-everything-i-can-get-my-hand-on experience with Firefox, the most common “total meltdown” of Firefox is the result of a corrupted user profile. If I had saved “last known good” profiles, I would not have had to manually rebuild my Firefoxen setups. Although the Infolister extension certainly makes that task much more manageable, an extension that provides for single-click Last Known Good Profile would be fantastic.