Or go ahead and use them, but abort if your password manager doesn't auto fill. Such abort scenarios include not only a password field without auto fill, but al

Or go ahead and use them, but abort if your password manager doesn't auto fill. Such abort scenarios include not only a password field without auto fill, but also a total lack of password field (e.g., sites that offer OTP-only authentication), since either way you don't have your password manager vetting the domain.