They only implement ctap1/u2f . CTAP2/FIDO2 part is completely unimplemented. And that's why e.g. TouchID doesn't work. Or newer devices that don't support the

They only implement ctap1/u2f . CTAP2/FIDO2 part is completely unimplemented. And that's why e.g. TouchID doesn't work. Or newer devices that don't support the old u2f standard. CTAP2 gives fancy features like enforcing a pin (which Firefox doesn't implement) or fingerprint (which Firefox doesn't implement).