Hmm, Attachment 9051490 [details] caused flickering on wayland, when multiple windows were opened. It seems like a wayland specific problem.
Bug 1532929 Comment 7 Edit History
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Hmm, Attachment 9051490 [details] caused flickering on wayland, when multiple windows were opened. It seems like a wayland specific problem. Then it seems better to not use SharedGL on wayland for now.