I tried Firefox 2 for a while but didn't like it as much as 1.5 and it has never recommended upgrading, I suspect 2 is really a Beta for mac and unless you want the spell checker, being unable to get rid of tabs bar is just a waste of screenspace. Why anybody should want IE is beyond me.

PS Stephen: you should be able to get windows of all and any application whatever size you want by dragging out bottom RH corner