Do you actually follow spec discussions, or are you just guessing? From what I have observed the Chrome, Firefox, and Safari teams are in constant communication. They discuss new features, implementation details, and potential pitfalls.
Despite all the suggestions of "browser wars", they're actually very friendly and collaborative.
> It is most likely that this will be added to other browsers like Firefox too.
> Microsoft’s new version of Edge is going to be based on Chromium, so this will be available on Edge too.
So, although some discussions with Firefox may have begun, it's clearly using the Microsoft decision to use Chromium as a way to force their standpoint. Note also the lack of mention of Safari.
This is the kind of stuff that should go thru a central committee because different browsers will react differently to what should be a simple url.
I've followed a few directly, and as a web developer I generally have my ear to the ground for these things. It's possible this feature was discussed, but the article made it sound like it wasn't in a formal capacity, and I know for a fact that Google has forced things through in the past, even when there's been active protest from people at Mozilla. And that was while Microsoft still had their own engines.
Nevertheless it's some kind of fait accompli, especially in a market with only three main actors.
Where one actor can also start using the new "standard" overnight and break lots of services for people which are not using their browsers... You know what I mean. It's some kind of enforcing to have a monopoly.
Despite all the suggestions of "browser wars", they're actually very friendly and collaborative.