title: Social authentication in an iOS HTML application
body: <p>I am starting a new client-side JS-based application using firebase.  I have Facebook authentication working properly (using popup-based authentication) when it is used on Desktop Safari / Chrome, as well as Safari on iOS.  What isn't working is when my app is added to the iOS Home Screen to run as an "application".  I have tried switching to redirect-based authentication but that does not seem to work either.</p>
  
  <p>I would love to see an example of how to properly do this so it works from both desktop and as an iOS web application.</p>
  
  <p>Thank you in advance</p>