I am saddened to have to say this but after so many years of being a FireFox advocate the latest version 4 release has vaulted me to Google Chrome.
The version 4 interface and the number of crashes I have encountered make FF no longer a viable solution for me.
I find Chrome to be much, much faster and the development of plugins especially Firebug and download manager support have erased any objections I have had in the past that have prevented me from making the switch.
I recall having the same reaction to IE5 when FF first arrived on the scene but, alas it is no longer the case.
Goodbye old friend
you served me well for many years.