code: function frame (form) {
    var name = 'ff-' + new Date().valueOf();
    $(form)
      .attr('autocomplete', 'on')
      .attr('target', name);
    return $('<iframe>')
      .css('display', 'none')
      .attr('id', name)
      .attr('name', name)
      .attr('src', 'javascript:void 0')
      .afterOf(form);
  }
docs: /* AJAX form submissions use an intermediary <iframe> to help browsers remember
  autocompletion suggestions. We submit the form against the <iframe> and then
  grab the response as plain-text JSON that we need to parse into JSON.
  Afterwards we can hand that JSON to the response handler, business as usual.
  Since we've submitted the form "organically", the browser stores suggestions.