Firefox.exe*32 process does not shut down when program is closed in version 17.0.1, on windows 7 64 bit OS.

When trying to open Firefox browser, I get a message Firefox is already running... You can stop the process or restart the computer. This is a recent problem and I can't think of any changes that may have occurred to change the functioning of the two programs.

The support article on Firefox "hanging" has a few pointer on Firefox failing to fully shut down and clean up after itself. Does anything here help:
https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding#w_firefox-hangs-when-you-quit-it

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    See "Hang at exit":
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    * https://support.mozilla.com/kb/Firefox+hangs

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  • Macbook does not shut down or restart. It stops at an blank white screen with the cursor moving around it. Updated to the latest software

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  • Macbook pro does not shut down, blue screen and turning wheel appears

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  • My computer does not shut down.

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    potvora,
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  • Laptop does not shut down completely after upgrading to Windows 10!!

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  • OS X does not shut down after iTunes is started

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