I saw this comment for a similar issue:

https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1931035/comments/2

Setting layers.acceleration.disabled = true before upgrading to FF89
makes the issue go away, but now I don't have acceleration for this
"feature".

Since it seems to be acceleration related, here is some info on my
graphics:

$ sudo lshw -c video
  *-display                 
       description: VGA compatible controller
       product: GP102 [GeForce GTX 1080 Ti]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:0a:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: iomemory:7f0-7ef iomemory:7f0-7ef irq:178 
memory:f5000000-f5ffffff memory:7fe0000000-7fefffffff 
memory:7ff0000000-7ff1ffffff ioport:e000(size=128) memory:f6000000-f607ffff

$ modinfo nvidia
filename:       /lib/modules/5.11.0-18-generic/updates/dkms/nvidia.ko
alias:          char-major-195-*
version:        460.84
supported:      external
license:        NVIDIA
srcversion:     BE511DEA3662B4CF045EC5D
alias:          pci:v000010DEd*sv*sd*bc03sc02i00*
alias:          pci:v000010DEd*sv*sd*bc03sc00i00*

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https://bugs.launchpad.net/bugs/1931388

Title:
  Firefox disaplayerror after Update on last version 89

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