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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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1798999

Title:
  firefox windows are black in Ubuntu 18.10

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> 
About Ubuntu
      Description:    Ubuntu 18.10
      Release:        18.10

  2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  firefox:
    Installed: 63.0+build1-0ubuntu1
    Candidate: 63.0+build1-0ubuntu1
    Version table:
   *** 63.0+build1-0ubuntu1 500
          500 http://ubuntu.osuosl.org/ubuntu cosmic/main amd64 Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen
  Normal web browsing experience

  4) What happened instead
  Graphical elements are black.  After upgrading to 18.10, firefox graphical 
elements (window contents, context menus) are black.  The only exception is a 
small rectangle in the upper left corner.

  Right-clicking within the window creates a context menu, which I am
  able to verify by observing a new black rectangle of the correct width
  that can be made to occlude the task bar by initiating it at a
  suitable starting position.

  If I launch firefox from a terminal then I get messages like the
  following:

  --------code

  [GFX1-]: Failed to lock new back buffer.
  [Parent 25238, Main Thread] WARNING: failed to open shm: Permission denied: 
file 
/build/firefox-MtV3KQ/firefox-63.0+build1/ipc/chromium/src/base/shared_memory_posix.cc,
 line 129

  --------/code

  
  This occurs regardless of which desktop environment I use.  Other browsers 
are working fine.

  I'm guessing the problem is related to the reported problem accessing
  shm. However, for the sake of completeness, I am using an AMD gpu with
  standard driver:

  01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
  [AMD/ATI] Curacao XT / Trinidad XT [Radeon R7 370 / R9 270X/370X]
  [1002:6810]

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