With Session Manager disabled, the Firefox process terminated much faster than before, however it still takes about 5-10 seconds.
Firefox (Safe Mode) has no problems at all, so I must conclude that an add-on is causing this. However, I'm not in the mood to go disabling my ~100 add-ons one at a time... Perhaps later...
The more of them you have, the longer it takes for firefox.exe process to end
My other laptop doesn't have this problem, and has about 80% of the add-ons this one has.
I'll have to investigate further...
since I don't have to restart FF anymore.
How come? Whaddya do?