Impossible to open or close ff and it prevents my MAC book closing. Impossible to delete and reinstall because it is open

I use OS El Capitan 10.11.1 and a mac book pro mid-2014.
Force Quit doesn't work. There are the small black dot in the icon showing that FF is open, but if I click on it nothing happens. I'm literally stuck. I have computer o my whizz kid, so all suggestions/help gratefully received. Thank you

You have the Firefox icon in your quick launch?
Close Firefox. Right-click on the icon
and select open new tab. Sometimes, it works.
If it opens, close it by Menu > file > output.

Close all the rest, and then press the power button until the computer is turned off.

Tags: Firefox

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