public static function load_form_js() {
    if (
      ! is_admin()
      && ( ! function_exists( 'amp_is_request' ) || ! amp_is_request() )
      && self::get_api_key()
      ) {
      wp_register_script( 'akismet-frontend', plugin_dir_url( __FILE__ ) . '_inc/akismet-frontend.js', array(), filemtime( plugin_dir_path( __FILE__ ) . '_inc/akismet-frontend.js' ), true );
      wp_enqueue_script( 'akismet-frontend' );
    }
  }