Want to know when Firefox will support Web Serial API, but turn out they won't since they consider it harmful: https://mozilla.github.io/standards-positions/#webserial
Consider:
> Show HN: Trick people into flashing their ESP32s with your firmware by visiting your web page
You can try a demo here: https://unjavascripter-web-serial-example.glitch.me/
I ran into this specific API following the great blues wireless tutorial (cell connectivity cards and dev cards with ESP32 support) which only works in Chrome https://dev.blues.io/get-started/quickstart/notecarrier-af/
Much like the container tabs extension, in terms of requiring an addon for certain functionality. Or, if mozilla doesn't do it themselves, a (horrifying though warning) third-party-extension with an external helper application to connect to the serial device, and a API polyfill injected into every page.