We've just tested internally with Firefox nightly with WebGPU enabled (you should also be able to test this with the fix Fredrik just pushed out), but it doesn't seem to work - Firefox's WebGPU implementation doesn't implement enough of the spec [0] to be able to run our renderer.

As I mentioned in another comment, we're considering adding a fallback renderer, but our hope is that Firefox will be able to complete its implementation sooner rather than later - as a Firefox user, I would much rather use it than Chrome myself!

[0]: https://github.com/gpuweb/gpuweb/wiki/Implementation-Status#...