I found with FF 2.0 RC3 that sometimes when I closed the browser, it held the firefox.exe process in memory and did not actually fully close it down (i.e. still showing on the task manager). Don't know if anyone else has had or have noticed a similar issue?
http://releases.mozilla.org/pub/mozi...0/win32/en-GB/
that is for the British version... gonna give it a go, see if its any different