Firefox doesn't exit when requested!

Hi, I'm running FF 3.6.3 on Vista SP2, and FF doesn't want to close when requested either through Alt-F4, right-top box or whatever... I have to open the Task Manager and kill it when I shut down my PC! Any clue?
Thanks in advance for any help!
Jean-Luc
== This happened ==
A few times a week
== ??

'''Instructions for Safe Mode and Troubleshooting'''
You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
See:
'''[[Troubleshooting extensions and themes]]'''
'''[[Troubleshooting plugins]]'''
'''[[Basic Troubleshooting]]'''
If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling '''one at a time''' until the problem reappears. '''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.

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Firefox doesn't exit when requested!

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