rem: return msgCompConvertible.No; 
add: return nsIMsgCompConvertible.No; 
context: function DetermineConvertibility(){    if (!msgCompose.composeHTML)        return msgCompConvertible.Plain;    try {        return msgCompose.bodyConvertible();    } catch(ex) {}    return msgCompConvertible.No;}
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/fc756976caf9a570751ca43fe3a185e7c7682a88/MsgComposeCommands.js/clean/mailnews/compose/resources/content/MsgComposeCommands.js