title: Enter key down does not open drop down in Mozilla
body: <p>Enter key does not open drop down in Mozilla.
  Works fine in Chrome.(Its chrome default behavior)</p>
  
  <p>Trying something like this to achieve it in Mozilla  </p>
  
  <pre><code>var self = this;
      $('select').on('keyup', function (e) {
          if (e.keyCode == 13) { $(this).trigger('click'); }
      });
  </code></pre>