add:   node = document.getElementById("fileAttachmentMenu"); if (node) node.setAttribute("disabled", "true"); 
context: function HideMessageHeaderPane(){  var node = document.getElementById("collapsedHeaderView");  if (node)    node.collapsed = true;  node = document.getElementById("expandedHeaderView");  if (node)    node.collapsed = true;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/1bf116705295b0116603516afe1ebdfff5576170/msgHdrViewOverlay.js/clean/mailnews/base/resources/content/msgHdrViewOverlay.js