Shipping WebGPU on Windows in Firefox 141 (via) WebGPU is coming to Mac and Linux soon as well:
Although Firefox 141 enables WebGPU only on Windows, we plan to ship WebGPU on Mac and Linux in the coming months, and finally on Android.
From this article I learned that it's already available in Firefox Nightly:
Note that WebGPU has been available in Firefox Nightly on all platforms other than Android for quite some time.
I tried the most recent Nightly on my Mac and now the Github Issue Generator running locally w/ SmolLM2 & WebGPU demo (previously) works! Firefox stable gives me an error message saying "Error: WebGPU is not supported in your current environment, but it is necessary to run the WebLLM engine."
The Firefox implementation is based on wgpu, an open source Rust WebGPU library.