Public bug reported:

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]

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- irefox windows are black in Ubuntu 18.10
+ firefox windows are black in Ubuntu 18.10

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https://bugs.launchpad.net/bugs/1798999

Title:
  firefox windows are black in Ubuntu 18.10

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