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

[Michael Weimann]

The suggested command

    sudo apparmor_parser -R /etc/apparmor.d/usr.bin.firefox

doesn't work for me :/
The profile is already disabled but Firefox still doesn't work.

I get many errors like:
Unable to init server: Could not connect: Connection refu###!!! [Parent][MessageChannel] Error: (msgtype=0x30000B,name=PContent::Msg_InitRendering) Channel error: cannot send/recvsed
(/usr/lib/firefox/firefox:7325): Gtk-WARNING **: 09:24:47.539: cannot open display: :1
[Parent 7238, Gecko_IOThread] WARNING: pipe error: Broken pipe: file /build/firefox-MtV3KQ/firefox-63.0+build1/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 729

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Title:
  firefox windows are black in Ubuntu 18.10

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