let target = e.originalTarget;
      while (target && !(target.localName == 'toolbarbutton'
                         || target.localName == 'button'
                         || target.localName == 'menuitem')) target = target.parentNode;
      id = target ? target.id : e.target.id;

      if ( (id == '') || 'Browser:ShowAllHistory, appmenu_history, PanelUI-historyMore,\
                          Tools:Downloads, downloadsHistory,\
                          Browser:ShowAllBookmarks, appmenu_bookmarks, appmenu_unsortedBookmarks, menu_unsortedBookmarks'
                          .indexOf(id) == -1 ) return;