I have a different problem with Firefox (XP). If I close it down and try to restart it almost immediately, it will refuse to run. I might have to try 5 or 6 time before it will actually start up again. If I let it rest for a while after I close it, it will start normally. It has been this way for quite some time. No freeze problems, though. Anyone else have this problem?
Sometimes if I close firefox then try to open it again it will tell me the program is still running even though it is not listed as running in task manager application tab. I click on the process tab from the task manager and shut the firefox.exe down. Then open firefox again and it opens.
Do you reboot the system?