I use Firefox to access the internet-but when I go off the internet but don't shut down, then go back on Firefox it won't open because "it is already running". Task Manager doesn't show that it is operating so I can't shut it off. What to do?

It is in the question but to repeat.
1. When I go online I use Mozilla Firefox
2. While I am doing other work, I usually close the internet.
3. If I go back on the internet and click on Mozilla it won't come up, stating that "it is already running".
4. Despite that, when I open Task Manager, it doesn't show that it is running so I can't shut it down or open it.
5. If I log off or shut off the computer, then after I log in or reboot the computer, I can open Mozilla.
Thanks from a Mozilla fan.

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.com/kb/Firefox+hangs

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