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Ubuntu (Studio) 20.04. Firefox 86 no longer starts. Re-install doesn't help

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I've ran apt remove --purge firefox and completely deleted the ~/.mozilla directory, reinstalled and still get a Mozilla Crash Reporter window.

If I try to run firefox from terminal I get: (Running in safe mode (firefox --safe-mode) makes no difference.)

   [GFX-]: glxtest: libpci missing.  

I haven't made any config or extension changes since it stopped working, and not sure what could be causing this. I don't mind starting from scratch, just need Firefox back. :)

I've ran apt remove --purge firefox and completely deleted the ~/.mozilla directory, reinstalled and still get a Mozilla Crash Reporter window. If I try to run firefox from terminal I get: (Running in safe mode (firefox --safe-mode) makes no difference.) [GFX-]: glxtest: libpci missing. I haven't made any config or extension changes since it stopped working, and not sure what could be causing this. I don't mind starting from scratch, just need Firefox back. :)