add: OnLeavingFolder(gMsgFolderSelected); 
context: function OnUnloadMessenger(){  pref.removeObserver("mail.pane_config.dynamic", MailPaneConfigObserver, false);  accountManager.removeIncomingServerListener(gThreePaneIncomingServerListener);  RemoveToolBarPrefListener();  // FIX ME - later we will be able to use onload from the overlay  OnUnloadMsgHeaderPane();  OnMailWindowUnload();}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/b156509fe019c5f28ac1f74323af49e8232321ac/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js