After exiting Firefox it remains in "process" list, preventing a relaunch

Running WIN 7 64 Bit Home
Firefox 3.6.8
After I exit Firefox, and go on to do other work, when I want to re-start Firefox, I get a message saying Firefox is running, but not responding, and I need to stop it first before restarting.
In Task Manager, Firefox does not appear in the Applications list. It does appear in the Processes list. Of course when I select it and click "end process" I get the usual warning of unexpected outcomes, but I do it anyway. This does not result in any problems. But I think this should not be happening.
Any advice or feedback appreciated.

Hi,
I hope [https://support.mozilla.com/en-US/kb/Firefox+exe+is+always+running this article] would solve this problem.
Kind regards,
Joren

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After closing, Firefox still remains in task manager's processes and could not open again!

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https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

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Firefox will not start, even though it is listed in my processes in task manager. Can't get profile manager to start either.
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== This happened ==
Every time Firefox opened
== Less than a week ago ==
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.86 Safari/533.4

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Pardon the typo above.
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I have this problem too.
Were all of your Firefox windows closed? (ex. download window ,popup windows) anyway, I hope they fix this problem soon.
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I haven't had this kind of a problem with prior versions of Firefox.

Firefox is already running but is not responding
* https://support.mozilla.com/en-US/kb/Firefox%20is%20already%20running%20but%20is%20not%20responding
Profile in use
* http://kb.mozillazine.org/Profile_in_use
Check and tell if its working.

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**Windows 7 users: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
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** http://support.mozilla.com/en-US/kb/Firefox+hangs
** http://kb.mozillazine.org/Firefox_hangs
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*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting
 
 
'''You need to update the following.''' The Plugin version(s) shown below was/were submitted with your question and is/are out of date. You should update to avoid known security issues with the version(s) you have installed. Click on "More system info..." to the right of your question to see what was included with your question.
*Adobe PDF Plug-In For Firefox and Netscape "9.3.3"
*Shockwave Flash 10.2 r152
*Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
#'''''Check your plugin versions''''' on either of the following links':
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#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
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#**Use IE to go to the above site to update the IE ActiveX
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'''Kill Application'''
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See: '''[http://kb.mozillazine.org/Kill_application Kill Application]'''
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'''[[Firefox hangs]]'''
'''[http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit Firefox hangs at exit (Mozillazine article)]'''
'''[[Firefox is already running but is not responding]]'''
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After exiting Firefox it remains in "process" list, preventing a relaunch

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