rem: aAttachment.messageUri); 
add: aAttachment.messageUri, aAttachment.isExternalAttachment); 
context: function saveAttachment(aAttachment){  messenger.saveAttachment(aAttachment.contentType,                            aAttachment.url,                            encodeURIComponent(aAttachment.displayName),                            aAttachment.messageUri);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/3613b75b68c5edb1e955250b4c653428e77b3315/msgHdrViewOverlay.js/clean/mail/base/content/msgHdrViewOverlay.js