getService(Components.interfaces.nsIObserverService). 
getService(Components.interfaces.nsIObserverService) 
function onNostalgyUnload() { var mSession = NostalgyMailSession(); if (mSession) mSession.RemoveFolderListener(NostalgyFolderListener); NostalgyRules.unregister(); Components.classes["@mozilla.org/observer-service;1"].   getService(Components.interfaces.nsIObserverService).   removeObserver(NostalgyObserver, "MsgMsgDisplayed");}
5720	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5720/c89dc652bc003466c411dbd9ecc915386ffa152d/nostalgy.js/clean/content/nostalgy.js