Do you have the Firefox icon on your quick launch? Close Firefox. Right click on the icon and select Open New Tab. Sometimes this works. If it opens, close it by Menu > File > Exit.

Close everything else, then press the power key until the computer is off.

FredMcD said

Do you have the Firefox icon on your quick launch? Close Firefox. Right click on the icon and select Open New Tab. Sometimes this works. If it opens, close it by Menu > File > Exit.

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Close everything else, then press the power key until the computer is off.

FredMcD said

Do you have the Firefox icon on your quick launch? Close Firefox. Right click on the icon and select Open New Tab. Sometimes this works. If it opens, close it by Menu > File > Exit.

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Close everything else, then press the power key until the computer is off.

Thank you Fred McD, problem resolved now!!

Is everything working properly now?

Yes thank you, all resolved!

Good to hear, safe surfing.

This does not solve the problem in the long run. Firefox resists all efforts to force quit it also. It will not allow the Macbook to shut down. If you have to shut down the computer to get it to exit the program it is no fix. The developers need to fix this with the next release.

Dmacfanatic

Please go to the top of any support.mozilla.org web page and use the Ask A Question link; https://support.mozilla.org/en-US/questions/new This will let us look at your system details. No Personal Information Is Collected.

I went to the page you suggested but it was the same as this page.