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It was basically built so password manager extensions could communicate with password manager apps to do things like yubikey support etc. before browsers started handling webauthn

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Oh wow, this is cool. Yep this would make USB Serial work on Firefox with a simple extension.

Extension + a native program for the extension to talk to. The native program has to manage accessing the usb device and providing an interface to the browser extension.

Yes, I have done this for (a fraction of) WebBluetooth. Albeit the extension API does not make it easy, and i don't know if you can implement the entire Web* API surface, but at least it is good enough for proofs of concept.

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