Firefox does not "close" when closed under Windows 7; Task Manager must be used to "End Process." How do I close Firefox and reopen it without getting a "Still Running" error message?

Even though Firefox has been updated multiple times (currently using Ver. 3.6.13) since I started using Windows 7, I am still unable to totally close it from the toolbar or taskbar. Firefox does closeout on the screen but apparently continues to run in the background. If I open Firefox at a later time, I get an error message stating that Firefox is still running. I then have to go Task Manager to "End Process." Electing to do so allows me to restart Firefox. I never had this problem with Firefox when using Windows XP and I never have this problem with any other software under Windows 7.

https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit

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