[Bug 1896508] [NEW] Firefox window disappears completely

[Morgan Wahl]

Public bug reported:

After running for a while, eventually the firefox window just becomes
completely transparent. The window manager (gnome-shell) still sees it,
and I can quit firefox. The dialog to ask me whether I want to quite
with open tabs opens up, but is just a blank window. Thankfully I know
where the "close tabs" button is and I click there and it works.

So, input events seem to work find and the window manager still sees the
window, but it's gone.

If I run firefox on the console I see this output when it happens:

Unflushed glGetGraphicsResetStatus: 0x92bb
[GFX1-]: [OPENGL] Failed to init compositor with reason: FEATURE_FAILURE_OPENGL_CREATE_CONTEXT

There is an upstream bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1535721 that suggests
looking at the value of layers.acceleration.force-enabled . Indeed it's
set to true by default in this build.

I'm running Pop!OS on a System76 laptop, but as far as I can tell from
apt, the firefox package is just the ubuntu build.

$ apt show firefox
Package: firefox
Version: 80.0.1+build1-0ubuntu0.20.04.1

$ firefox --full-version
Mozilla Firefox 80.0.1 20200831163820 20200831163820

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

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Title:
  Firefox window disappears completely

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