Ugh, looks like it _is_ Pop!OS's fault. I see this file:
$ cat /usr/lib/firefox/defaults/pref/pop-default-settings.js
pref("layers.acceleration.force-enabled", true);
pref("widget.content.gtk-theme-override", "Pop");
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https://bugs.launchpad.net/bugs/1896508
Title:
Firefox window disappears completely
Status in firefox package in Ubuntu:
New
Bug description:
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
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