Of course, because outside Apple's iDevices ecosystem what you have now is the ChromeOS Platform, with a standards body that basically rubber stamps what Google and everyone shipping Chrome forks want.
It's up to the other browser vendors to implement similar extensions. It's just that most people involved with WASM seem to have ended up at Google (see Emscripten which moved to Google when Mozilla lost interest in innovating).
So it doesn't work in any other browser? More incentive for those web 4.0 or 5.0, i lost count, "experts" to only support Chrome?