rem: pref.removeObserver("mail.pane_config.dynamic", MailPaneConfigObserver); 
add: pref.removeObserver("mail.pane_config.dynamic", MailPrefObserver); pref.removeObserver("mail.showFolderPaneColumns", MailPrefObserver); 
context: function OnUnloadMessenger(){  accountManager.removeIncomingServerListener(gThreePaneIncomingServerListener);  pref.QueryInterface(Components.interfaces.nsIPrefBranchInternal);  pref.removeObserver("mail.pane_config.dynamic", MailPaneConfigObserver);  // 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/2006/5872/3a3e075b789b1f26bc0275d9a9fb316184a31ad2/msgMail3PaneWindow.js/buggy/mail/base/content/msgMail3PaneWindow.js