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downloaded 6.0 firefox will not shutdown now without restarting my computer HELP PLEASE

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when i try to shut down firefox now i get a window that says firefox is still running to shut it down restart your system. it started doing this the day after i downloaded 6.0. it was so annoying i uninstalled it and am using an old version i still had the set up for. but it say it is no longer protected from attack. please help !!!

when i try to shut down firefox now i get a window that says firefox is still running to shut it down restart your system. it started doing this the day after i downloaded 6.0. it was so annoying i uninstalled it and am using an old version i still had the set up for. but it say it is no longer protected from attack. please help !!!

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Seeing this as well. Very, very frustrating. I have to kill the exe each time it does this. Was not happening prior to 6. I am now running 6.0.1 and the problem persists.