docs: function _getUui() {
          var navigator_info = window.navigator;
          var screen_info = window.screen;
          var uid = navigator_info.mimeTypes.length;
  
          uid += navigator_info.userAgent.replace(/\D+/g, '');
          uid += navigator_info.plugins.length;
          uid += screen_info.height || '';
          uid += screen_info.width || '';
          uid += screen_info.pixelDepth || '';
  
          return uid;
      }