{
{   nsAutoVoidArray prefArray;
nsPref::EnumerateChildren(const char *parent, PrefEnumerationFunc callback, void *arg) {       EnumerateData ed;    ed.parent = parent;    ed.callback = callback;    ed.arg = arg;    PL_HashTableEnumerateEntries(gHashTable, pref_enumChild, &ed);    return NS_OK;}