Firefox 16 will not close in mac 10.6.8

I am using a MacBook (MacBook6,1)
Mac OS X v 10.6.8
Firefox 16.0.2
When I close or quit Firefox the windows will disappear however the program will continue.
I have to do a "Force Quit" to get it to completely shutdown.
This seams to happen more the longer Firefox is running or it the computer had gone to sleep and is woken up.

Hello carl.johnson47, a problematic extension can cause same problem, which can be resolved by disabling or uninstalling the extension see: [https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems#os=mac&browser=fx17 Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]
see also : [https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding#w_firefox-hangs-when-you-quit-it Firefox hangs when you quit it]
thank you

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