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Firefox is on the brink of being dropped by the US Government
(www.brycewray.com)
This is a most excellent place for technology news and articles.
So... Chrome and Safari? Because the rest of browsers are just rebranded Chrome.
I'm not particularly a fan of passkeys, because I'm fairly happy with my password manager, but personal opinions apart, just because Google and Apple decided to implement a feature, that doesn't make it an standard.
This is why Chrome having the web engine monopoly is such a big problem. They can implement whatever they want and because it will also be adopted by Edge, Opera and others, it seems to automatically be considered a web standard and websites will start using it even when the other major independent browser (Firefox) hasn't implemented it.