Very similar symptons here on F13 AI 9 HX 370 running Ubuntu 24.
Sounds like you might be hitting this:
To confirm it, consider checking your logs (journal / dmesg) to see if you have errors mentioning something like:
may 06 17:00:48 cheshire kernel: amdgpu 0000:c1:00.0: amdgpu: ring vcn_unified_0 timeout, signaled seq=206212>
And:
may 06 17:00:49 cheshire kernel: amdgpu 0000:c1:00.0: amdgpu: GPU reset(1) succeeded!
To do so, run this:
sudo journalctl --no-pager|grep -P '(GPU reset|vnc_unified_0)'
EDIT: For the moment I’ve disabled hardware acceleration on Firefox and I haven’t seen it happen again.