uriStr.Append(NS_LITERAL_STRING(".properties"));
uriStr.AppendLiteral(".properties");
LoadProperties(const nsString& aName,               nsCOMPtr<nsIPersistentProperties>& aProperties){  nsAutoString uriStr;  uriStr.Assign(NS_LITERAL_STRING("resource://gre/res/fonts/mathfont"));  uriStr.Append(aName);  uriStr.StripWhitespace(); // that may come from aName  uriStr.Append(NS_LITERAL_STRING(".properties"));  return NS_LoadPersistentPropertiesFromURISpec(getter_AddRefs(aProperties),                                                 NS_ConvertUTF16toUTF8(uriStr));}