Firefox won't fully open, won't quit or force quit, and won't let computer shut down.

No screen, so I can't start in safe mode; won't quit; won't force quit; won't let me uninstall the app; won't allow the computer to restart because the app is supposedly "open"

Rebooting the computer should close everything.
Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift ''(Mac Options)'' >''' key, and then starting Firefox. Is the problem still there?
While you are in safe mode;
Type '''about:preferences#advanced'''<Enter> in the address bar.
Under '''Advanced,''' Select '''General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?

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