title: Required tooltip displayed when close modal in FireFox
body: <p>Got a strange issue, I am developing an angularJS app that is to use Firefox only but I have an issue with the tooltip on a modal if the user clicks the <code>Close</code> button.</p>
  
  <p>When the modal opens there is a dropdown list which is blank by default and is also required. The modal also has a <code>Submit</code> button and <code>Close</code> button.  The <code>Submit</code> button is disabled until all mandatory fields are completed and the <code>Close</code> button is always enabled.</p>
  
  <p>If you click the <code>Close</code> button without selecting an option (which is a valid action) the modal closes as expected but the required tooltip is displayed.</p>
  
  <p>Does anyone know of a fix for this issue?</p>