I didn’t need to write this post, but I did anyway, because I felt the need to document my ~2 hours of ferocious searching to figure out why something went wrong. I wanted to test WebGL and VA-API hardware acceleration on Wayland on Firefox, new in FF 75. VA-API has been implented on Wayland before (!) X11 (bug), which gives me a sliver of hope for the future of Linux, and I suppose shows where priorities lie.