I can reproduce under Wayland. A work-around will be to use Xorg, be it
"Ubuntu on Xorg" when logging in or some other X window manager (e.g.
'apt install icewm').
The cannot open display error is concerning too.
** Changed in: firefox (Ubuntu)
Status: New => Triaged
** Changed in: firefox (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/2142397
Title:
Firefox Kiosk Mode black screen
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