add: OnLeavingFolder(gMsgFolderSelected); 
context: function OnUnloadMessenger(){  accountManager.removeIncomingServerListener(gThreePaneIncomingServerListener);  pref.QueryInterface(Components.interfaces.nsIPrefBranchInternal);  pref.removeObserver("mail.pane_config.dynamic", MailPrefObserver);  pref.removeObserver("mail.showFolderPaneColumns", MailPrefObserver);  // FIX ME - later we will be able to use onload from the overlay  OnUnloadMsgHeaderPane();  OnMailWindowUnload();}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/60989b3e81e2f9f49e67583ea39024aa256bc520/msgMail3PaneWindow.js/clean/mail/base/content/msgMail3PaneWindow.js