rem: if (menu.collapsed == button.collapsed) menu.collapsed = !menu.collapsed; 
add: if (menu.hidden == button.collapsed) menu.hidden = !menu.hidden; 
context:   updateOverflowMenu: function (aMenuPopup)  {    var hbox = document.getElementById("bookmarks-ptf");    for (var i = 0; i < hbox.childNodes.length; i++) {      var button = hbox.childNodes[i];      var menu = aMenuPopup.childNodes[i];      if (menu.collapsed == button.collapsed)        menu.collapsed = !menu.collapsed;    }  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/4642e4b8d3aa0efb44b5fa3a6bccc9ee2fcd4844/bookmarksMenu.js/clean/xpfe/components/bookmarks/resources/bookmarksMenu.js