Intent to ship: Add-On-Gated Web Serial

[Greg Stoll]

As of Firefox 151, I intend to turn the Web Serial API on by default on Windows, Mac, and Linux. It has been developed behind the dom.webserial.enabled preference. Status in other browsers:
- Blink: Shipped since version 89
- WebKit: negative position ( https://webkit.org/tracking-prevention/#anti-fingerprinting )

Bug to turn on by default:
https://bugzilla.mozilla.org/show_bug.cgi?id=2029625

Standard:
We are pursuing standardizing the WebSerial API in the WHATWG in a new Workstream: https://github.com/whatwg/sg/pull/264
We have implemented based on and helping good faith iterate the current incubation editor's draft https://wicg.github.io/serial/ which the editor supports standardizing in WHATWG as we have proposed.

Intent to Prototype Thread:
This feature was previously discussed in this "Intent to Prototype" thread:
https://groups.google.com/a/mozilla.org/g/dev-platform/c/EDLTASS4Zik