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Firefox is not shutting down on command. When I try to get back up the dialog says it is still running and I must restart the Laptop

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I shut down the browser and close my laptop without shutting down computer. When i come back and attempt to start a session, the dialog says Firefox is running, but not responding. I need to restart computer. Just started happening.

I shut down the browser and close my laptop without shutting down computer. When i come back and attempt to start a session, the dialog says Firefox is running, but not responding. I need to restart computer. Just started happening.

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But are you shutting down Firefox properly...

see my answer in https://support.mozilla.com/en-US/questions/860929