code: boolean isExternalbrowserAuthenticator()
    {
      String authenticator = (String) connectionPropertiesMap.get(
          SFSessionProperty.AUTHENTICATOR);
      return ClientAuthnDTO.AuthenticatorType.EXTERNALBROWSER.name()
          .equalsIgnoreCase(authenticator);
    }
docs: Returns true If authenticator is EXTERNALBROWSER.
  
  @return true if authenticator type is EXTERNALBROWSER