This seems to be possibly a bunch of OOM related issues, so I wonder if going with straight Software WebRender with no D3D11 involvement at least clears up some of the symptoms.
Bug 1729779 Comment 11 Edit History
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This seems to be possibly a bunch of OOM related issues, so I wonder if going with straight Software WebRender with no D3D11 involvement at least clears up some of the symptoms. This is a very low memory config, only 2gb total memory, and free memory much less...