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Can't create or use Passkey in Firefox Android, Waterfox or Firefox Nightly

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I have a Pixel 8 Pro, I 'see' Paypal passkeys created by my Win 11 machine and by Chrome on my Pixel 8 Pro. The passkey page on PayPal says passkeys can't be created on 'this device or browser'. Exact same screen on all three firefox browsers.

Tried creating a passkey for www.yahoo.com and it says 'Passkey could not be created. Try Again' So that says it's not specific site related. Can a site dictate what's allowed? ( I have no idea)

Most sites seems to specify the browsers accepted but I assume that's just regurgitating the specs and usually out of date?

I saw the post from September that said it was fixed in Nightly, but that doesn't seem to be the case in the current Nightly from the Play Store.

I have a Pixel 8 Pro, I 'see' Paypal passkeys created by my Win 11 machine and by Chrome on my Pixel 8 Pro. The passkey page on PayPal says passkeys can't be created on 'this device or browser'. Exact same screen on all three firefox browsers. Tried creating a passkey for www.yahoo.com and it says 'Passkey could not be created. Try Again' So that says it's not specific site related. Can a site dictate what's allowed? ( I have no idea) Most sites seems to specify the browsers accepted but I assume that's just regurgitating the specs and usually out of date? I saw the post from September that said it was fixed in Nightly, but that doesn't seem to be the case in the current Nightly from the Play Store.

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