Most of these were probably disabled because of the window occlusion thing making them timeout. We fixed that in this bug so we don't need them anymore. Whatever the reason these all pass now and don't seem to be intermittent failures either.
There is still one test that we must skip on wayland for failure though, dom/media/tests/crashtests/1490700.html, but I think it's related to some webrtc feature that is not implemented on wayland perhaps.
Differential Revision: https://phabricator.services.mozilla.com/D208078
