rem: var folderPaneHeader = document.getElementById("folderPaneHeader"); folderPaneHeader.setAttribute("hidden", showColumns ? "true" : "false"); 
context: function UpdateFolderColumnVisibility(){  var folderNameCol = document.getElementById("folderNameCol");  var showColumns = pref.getBoolPref("mail.showFolderPaneColumns");  var folderUnreadCol = document.getElementById("folderUnreadCol");   var folderColumnLabel = document.getElementById("folderColumnLabel");  if (!showColumns)  {    var folderTotalCol = document.getElementById("folderTotalCol");    var folderSizeCol = document.getElementById("folderSizeCol");    folderUnreadCol.setAttribute("hidden", "true");    folderTotalCol.setAttribute("hidden", "true");    folderSizeCol.setAttribute("hidden", "true");    folderNameCol.removeAttribute("label");  }  else  {    folderNameCol.setAttribute("label", folderColumnLabel.value);  }  folderNameCol.setAttribute("hideheader", showColumns ? "false" : "true");  var folderPaneHeader = document.getElementById("folderPaneHeader");  folderPaneHeader.setAttribute("hidden", showColumns ? "true" : "false");  var folderTree = document.getElementById("folderTree");  folderTree.setAttribute("hidecolumnpicker", showColumns ? "false" : "true");  var hidden = folderUnreadCol.getAttribute("hidden");  if (hidden != "true")  {    var folderNameCell = document.getElementById("folderNameCell");    folderNameCell.setAttribute("label", "?folderTreeSimpleName");  }} 
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/dd57cd0f7dc4f31b98b6ae21d9e91fe2762f11b7/msgMail3PaneWindow.js/buggy/mail/base/content/msgMail3PaneWindow.js