[Bug 1798999] Re: firefox windows are black in Ubuntu 18.10

[Linda]

Similar thing happened to me in Ubuntu 18.04.  Today is the first day of
my installation of 18.04.  At first Firefox worked fine.  Then I was
tweaking a few things after the system upgrade to 18.04, and added the
date to the top menu bar / task bar by typing "sudo gsettings set
org.gnome.desktop.interface clock-show-date true" in the terminal window
at the bash prompt.  It didn't show the date, so I rebooted, and then it
showed the date.  Then I clicked on Firefox.  And it was not a black
screen, not a white screen, but a clear screen.  That is, a transparent
screen.

"sudo apparmor_parser -R /etc/apparmor.d/usr.bin.firefox" fixed it for
me.

Thank you Olivier Tilloy (osomon) !

I have edited /etc/apparmor.d/usr.bin.firefox in the past when Firefox
gave a black screen, after updating to Firefox version 51.0.1 two years
ago.  What fixed it the black screen then is described here:

  https://bugzilla.mozilla.org/show_bug.cgi?id=1334748#c7

but now my copy of usr.bin.firefox is the same as usr.bin.firefox.dpkg-
dist

which I think means it's the same as the current distribution file,
although I'm not sure, so I don't know what's going on or why this
happened.

** Bug watch added: Mozilla Bugzilla #1334748
   https://bugzilla.mozilla.org/show_bug.cgi?id=1334748

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Title:
  firefox windows are black in Ubuntu 18.10

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