http://www.lifehacker.com/software/firefox...eaks-209941.php
Fast and simple way to config firefox 2.0 settings to the way you want it. If you don't like the way 2.0 is set up, you can revert to using the old version (i.e. new version has an "x" for each closing tab and it can be annoying if you accidentally close the tab by switching to it, whereas old version the "x" is all the way to the right so you can switch tabs w/o worrying it will close it by accident).
I don't know if this has been posted before or where I should post this topic but please take necessary action if you deem fit.