Comment 16 for bug 1916469

On my PC I have 6 partitions with different Ubuntu releases (with or without proposed) and Firefox behaves differently
Ubuntu 89.0.1 91.0a1
x2-impish-0615 5.11.0-18-generic wayland xwayland
x3-groovy 5.8.0-55-generic xwayland xwayland
x4-focal 5.8.0-55-generic xwayland xwayland
x5-hippo-x 5.11.0-18-generic wayland xwayland
x6-impish-0501 5.11.0-18-generic wayland xwayland
x7-hippo 5.11.0-18-generic wayland xwayland
My hardware:
corrado@corrado-x2-ii-0615:~$ inxi -CG
CPU:
  Info: Dual Core model: Intel Core i3-7100 bits: 64 type: MT MCP
  L2 cache: 3 MiB
  Speed: 800 MHz min/max: 800/3900 MHz Core speeds (MHz): 1: 800 2: 800
  3: 800 4: 800
Graphics:
  Device-1: Intel HD Graphics 630 driver: i915 v: kernel
  Device-2: ARC USB 2.0 Camera type: USB driver: uvcvideo
  Display: wayland server: X.Org 1.21.1.1 driver: loaded: i915
  note: n/a (using device driver) resolution: 1920x1080~60Hz
  OpenGL: renderer: Mesa Intel HD Graphics 630 (KBL GT2) v: 4.6 Mesa 21.1.0
corrado@corrado-x2-ii-0615:~$