I have enabled webgpu in Firefox (set `dom.webgpu.enabled` to true) but it just says, "your browser does not support WebGPU". No, actually it does support WebGPU it's just that you're not detecting that properly.
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#...