I think, both FF and chromium on Linux disable WebGPU by default. Of course, it depends on where exactly did you get it (what kind of default settings people that packaged it for your distro used).
Just look up "<browser name> enable webgpu" in you favorite search system or ask an LLM chatbot "How to enable WebGPU in <browser name>?", follow the instructions and it should work just fine.
Just look up "<browser name> enable webgpu" in you favorite search system or ask an LLM chatbot "How to enable WebGPU in <browser name>?", follow the instructions and it should work just fine.