Firefox 133.0.3 (XFCE 4.18, Kernel 6.8.0.51, Ubuntu 24.04.1 LTS) flickering and possibly crashes xorg

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I have Ubuntu 24.04 running and recently installed XFCE as I got crazy with Gnome.
There’s some weird behavior with Firefox (and Librewolf) where I get some flickering regions (most of the time in the left region of the screen). See for example here:

imgur.com/a/9TRqdc2

When it happens the window behind Firefox is shining through (Reaper in this case).

I did some tests and the problem seems only to occur when the XFCE compositor is on. When it is off there’s no such flickering. There’s also no problem with Chromium. The flickering can be triggered (most likely) when zooming into a busy webpage (with Ctrl + Scroll).

If the flickering occurs very often within a short time my desktop crashes and recovers again.

Kernel messages are:

Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu: [gfxhub] page fault (src_id:0 ring:24 vmid:1 pasid:32770, for process Xorg pid 2093 thread Xorg:cs0 pid 2209)
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu:   in page starting at address 0x000080010ee44000 from client 0x1b (UTCL2)
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu: GCVM_L2_PROTECTION_FAULT_STATUS:0x00101030
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu:          Faulty UTCL2 client ID: TCP (0x8)
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu:          MORE_FAULTS: 0x0
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu:          WALKER_ERROR: 0x0
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu:          PERMISSION_FAULTS: 0x3
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu:          MAPPING_ERROR: 0x0
Jan 04 18:09:14 fox kernel: amdgpu 0000:0d:00.0: amdgpu:          RW: 0x0
Jan 04 18:09:24 fox kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx_0.0.0 timeout, but soft recovered
Jan 04 18:09:28 fox lightdm[8918]: gkr-pam: couldn't unlock the login keyring.
Jan 04 18:09:28 fox jackdbus[8962]: default: failed to stat "/var/lib/lightdm/.config/jack/conf.xml", error is 2 (No such file or directory)

Graphics:
  Device-1: AMD driver: amdgpu v: kernel
  Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X:
    loaded: amdgpu unloaded: fbdev,modesetting,vesa dri: radeonsi gpu: amdgpu
    resolution: 1920x1080~60Hz
  API: EGL v: 1.5 drivers: radeonsi,swrast platforms: x11,surfaceless,device
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 24.0.9-0ubuntu0.3
    renderer: AMD Radeon Graphics (radeonsi raphael_mendocino LLVM 17.0.6 DRM
    3.57 6.8.0-51-generic)

System:
  Host: fox Kernel: 6.8.0-51-generic arch: x86_64 bits: 64
  Desktop: Xfce v: 4.18.1 Distro: Ubuntu 24.04.1 LTS (Noble Numbat)
fox@fox:~$ inxi -C
CPU:
  Info: 8-core model: AMD Ryzen 7 9700X bits: 64 type: MT MCP cache: L2: 8 MiB
  Speed (MHz): avg: 5533 min/max: 600/5581 cores: 1: 5542 2: 5541 3: 5547
    4: 5524 5: 5542 6: 5545 7: 5513 8: 5533 9: 5525 10: 5538 11: 5540 12: 5519
    13: 5524 14: 5536 15: 5540 16: 5523

Where should I report this bug ideally. Bugzilla?

I’m testing 128.5.2esr now.

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