Huh, I thought Mozilla's position on this was negative, and it was. However, that was revised to neutral in 2024 https://github.com/mozilla/standards-positions/pull/959
And then an implementation was opened for review 2 months ago
https://bugzilla.mozilla.org/show_bug.cgi?id=2010930
WebSerial has landed in Firefox Nightly !! 🎉
Enable it in about:config and it all just works as expected. Took a brand new ESP32 and had a new Bluetooth proxy added to Home Assistant within 2 minutes 👌
