add: var renameFolderMenu = document.getElementById('menu_renameFolder'); if(renameFolderMenu) renameFolderMenu.setAttribute("hidden", "true");  
context: function HideMenus(){	var message_menuitem=document.getElementById('menu_showMessage');	if(message_menuitem)		message_menuitem.setAttribute("hidden", "true");	var expandOrCollapseMenu = document.getElementById('menu_expandOrCollapse');	if(expandOrCollapseMenu)		expandOrCollapseMenu.setAttribute("hidden", "true");}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/f8f0cb1c520d9c247917377952dfe8b507af2aff/messageWindow.js/buggy/mailnews/base/resources/content/messageWindow.js