Why is firefox not fully closing in Windows 7 64 bit on my I5 notebook?

Most of the time when I close firefox and then wait a bit then try to pull it up it says that firefox is already running. So I have to go to task manager and force a close. I have an Acer Aspire 5741G, 4 gigs of DDR3 ram, the I5-430M Processor. I just got the notebook 2 months ago and have updated Windows 7, Firefox, and made sure that the laptop drivers are all updated, Java, flash too. The funny thing is that sometimes it does shut down all the way, but most of the time it doesn't.
Thanks,
John

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

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