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Firefox blocks automatic shutdown

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I have my Catalina Mac set up to automatically shut down at 2AM in case I walk away and forget to shut it down. I do this through System Preferences -> Energy Saver -> Schedule ... The next morning the Mac is still running and a pop-up says that shutdown was blocked by Firefox. How can this behavior be overridden so that I don't have to remember to close Firefox each time.

I have my Catalina Mac set up to automatically shut down at 2AM in case I walk away and forget to shut it down. I do this through System Preferences -> Energy Saver -> Schedule ... The next morning the Mac is still running and a pop-up says that shutdown was blocked by Firefox. How can this behavior be overridden so that I don't have to remember to close Firefox each time.

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aki66 said

https://support.mozilla.org/en-US/questions/1174246#answer-1006163 this answer will help you

Thanks for the pointer but that case seemed more like a problem with crashing. My problem is that when I shutdown, firefox's pop-up block further progress on shutdown until it is acknowledged. I attached the pop-up this time.

I think my problem is caused by the Firefox's default behavior of popping up a warning when closing a window or shutting down with more than one tab open. I disabled this behavior by unchecking the box in shown in the other screen shot and at least a manual shutdown now works. I'll see if the automated shutdown now works.