As reported on https://www.reddit.com/r/firefox/comments/euak7b/this_occasionally_happens_when_im_using_firefox/ (there is a video posted there).

From the symptom, it seems like a driver problem.

https://nvidia.custhelp.com/app/answers/detail/a_id/3473

https://www.nvidia.com/download/driverResults.aspx/112596/en-us

Nvidia stopped driver support for GeForce 8/9/200 series GPUs 3 years ago, last driver was released in December 2016.

It seems that Direct3D 11 (Advanced Layers) compositor does not work well with the driver. NVIDIA GeForce 210 belongs to GT218. Then it seems better to block Advanced Layers on GT218.

https://envytools.readthedocs.io/en/latest/hw/pciid.html#gt218

How do we know that disabling Advanced Layers fixes it?

Asif Youssuff, is it possible to ask if the following builds could address the problem?

• [1] Disable advanced layer on Nvidia GT218
  • https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/WlzRLrDnQb-rxw3V9vGjAA/runs/0/artifacts/public/build/target.zip
  • https://treeherder.mozilla.org/#/jobs?repo=try&revision=93875075db0444d13c7dc4730e298fc0c4147350
• [2] Disable all gfx features on Nvidia GT218
  • https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Sw8_XnfOQoSp9PLj5Di2xg/runs/0/artifacts/public/build/target.zip
  • https://treeherder.mozilla.org/#/jobs?repo=try&revision=1a79887559116a1f5d767dd5456e88d565e7ca09

Sotaro, the user now says that the issue "resolved itself" - no feedback on the builds you produced.

Sorry.

No problem. Thank you:)