rem: var msgHdr = messenger.messageServiceFromURI(msgURI).messageURIToMsgHdr(msgURI); 
add: var msgHdr = messenger.msgHdrFromURI(msgURI); 
context: function checkMsgHdrPropertyIsNot(aProperty, aValue){  // we want to get the msg hdr for the currently selected message,  // get the appropiate property on it and then test against value.  var msgURI = GetLoadedMessage();      if (msgURI && !(/type=application\/x-message-display/.test(msgURI)))  {    var msgHdr = messenger.messageServiceFromURI(msgURI).messageURIToMsgHdr(msgURI);    return (msgHdr && msgHdr.getUint32Property(aProperty) != aValue);  }  return false;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/fe07aedeea0c9be3af990dba4844697f2a13c40e/mailWindowOverlay.js/buggy/mailnews/base/resources/content/mailWindowOverlay.js