add: var viewMessagesMenu = document.getElementById('viewMessagesMenu'); if(viewMessagesMenu) viewMessagesMenu.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");	var renameFolderMenu = document.getElementById('menu_renameFolder');	if(renameFolderMenu)		renameFolderMenu.setAttribute("hidden", "true");}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/18196c4b732af6b94e9651fc3dc40ab0eabfa685/messageWindow.js/clean/mailnews/base/resources/content/messageWindow.js