add: if (event.button != 0) return;  
context: function AttachmentBucketClicked(event){  if (event.originalTarget.localName == 'treechildren')    goDoCommand('cmd_attachFile');}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f0b97df6c631e81e8c2cd94ac035de73461c43b6/MsgComposeCommands.js/buggy/mailnews/compose/resources/content/MsgComposeCommands.js