rem: xulElement.setAttribute("command", "cmd_" + aCommandName.substring(NC_NS_CMD.length));  
add: var cmd = "cmd_" + aCommandName.substring(NC_NS_CMD.length) xulElement.setAttribute("command", cmd);  
context:   createMenuItem: function (aDisplayName, aCommandName, aItemNode)  {    const kXULNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";    var xulElement = document.createElementNS(kXULNS, "menuitem");    xulElement.setAttribute("cmd", aCommandName);    xulElement.setAttribute("command", "cmd_" + aCommandName.substring(NC_NS_CMD.length));    switch (aCommandName) {    case NC_NS_CMD + "open":      xulElement.setAttribute("label", aDisplayName);      xulElement.setAttribute("default", "true");      break;    case NC_NS_CMD + "openfolder":      xulElement.setAttribute("default", "true");      if (aItemNode.localName == "hbox")         // Don't show an "Open Folder" item for clicks on the toolbar itself.        return null;    default:      xulElement.setAttribute("label", aDisplayName);      break;    }    return xulElement;  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/b58a221f2fde203195889c6df948140558b290e2/personalToolbar.js/clean/xpfe/browser/resources/content/personalToolbar.js