The proof is in the article: > 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

The proof is in the article: > 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.