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
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