rem: Components.interfaces.nsIPrefLocalizedString); 
add: Components.interfaces.nsIPrefLocalizedString).data; 
context: function setHomePageToDefaultPage(folderFieldId){  var homePageField = document.getElementById(folderFieldId);  var prefService = Components.classes["@mozilla.org/preferences-service;1"]                              .getService(Components.interfaces.nsIPrefService);  var prefs = prefService.getDefaultBranch(null);  var url = prefs.getComplexValue("mailnews.start_page.url",                                  Components.interfaces.nsIPrefLocalizedString);  homePageField.value = url;}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/aa65825ca918a7de801deee2c11e3ddb0889e209/pref-mailnews.js/clean/mailnews/base/prefs/resources/content/pref-mailnews.js