rem: onEditFilter(); 
add: var row = {}, colID = {}, childElt = {}; var filterTree = document.getElementById("filterTree"); filterTree.treeBoxObject.getCellAt(event.clientX, event.clientY, row, colID, childElt); if (row.value == -1 || row.value > filterTree.view.rowCount-1 || event.originalTarget.localName != "treechildren") {  return; }    var col = document.getElementById(colID.value); if (col.getAttribute("cycler") != "true") onEditFilter(); 
context: function onFilterDoubleClick(event){    // we only care about button 0 (left click) events    if (event.button != 0 || event.originalTarget.localName != "treechildren")      return;    onEditFilter();}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/78d8c01fb52bb146ec9e60b225a03805e399adef/FilterListDialog.js/buggy/mailnews/base/search/resources/content/FilterListDialog.js