rem: pref.SetIntPref("mail.ui.folderpane.version", 2); 
add: pref.setIntPref("mail.ui.folderpane.version", 2); 
context: function UpgradeFolderPaneUI(){  var folderPaneUIVersion = pref.GetIntPref("mail.ui.folderpane.version");  if (folderPaneUIVersion == 1) {    var folderUnreadCol = document.getElementById("folderUnreadCol");    folderUnreadCol.setAttribute("hidden", "true");    var folderTotalCol = document.getElementById("folderTotalCol");    folderTotalCol.setAttribute("hidden", "true");    pref.SetIntPref("mail.ui.folderpane.version", 2);  }}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/faf03ce445712b372523f881cc3144cfadc7a611/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js