Yep, that’s what I’ve been doing on FF 2....but I don’t want to re-download FF 3 ‘cuz I’m not sure if it will work that way. Besides, on FF 3 I have been able to get only 14 sites on my drop-down list, while on FF 2 the # was unlimited.
I would also hate to re-download FF 3 & then find out that FF 2 is unable to download again, & is kaput.
Maybe the number of sites is controlled by the "about:config" command.
As far as clearing the location bar in Firefox 2 or 3, try the knowledge base: