Firefox hang in task list after closing successfully

OS: windows 7 32 and 64-bit
Symptom: firefox can be open can close "properly" without error message. But when you look in the task list, firefox is still there. You still can open firefox without problem. It will add another process if you close it. So more and more processes in the task list if you repeating open and close after surfing some web sites. You cannot kill the task, even you are administrator. The only way to get rid of it is to re-start the PC.
It happens in 3 of my PCs.

Most often hanging at exit is caused by Extensions, maybe plugins. Try Firefox Safe Mode; don't check any items, just click "Continue to Safe Mode". http://support.mozilla.com/en-US/kb/Safe+Mode
See more:
*http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit
*http://kb.mozillazine.org/Firefox.exe_always_open
*http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*http://support.mozilla.com/en-US/kb/Basic+Troubleshooting

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    Details
    Metadata
    Modules
    Raw Dump
    Extensions
    Signature mozalloc_abort(char const* const) | NS_DebugBreak | nsDebugImpl::Abort(char const*, int) More Reports Search
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    Release Channel release
    OS Windows NT
    OS Version 6.1.7601 Service Pack 1
    Build Architecture x86
    Build Architecture Info GenuineIntel family 6 model 42 stepping 7 | 4
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    Crash Address 0x74111425
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    0x8086
    Adapter Device ID
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    Available Virtual Memory
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    System Memory Use Percentage
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    Available Page File
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    Available Physical Memory
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