title: Why does my firebase Google Auth popup close immediately?
body: <p>I'm following <a href="https://codelabs.developers.google.com/codelabs/firebase-web/#6" rel="noreferrer">this tutorial</a> to learn firebase.  I cloned <a href="https://github.com/firebase/friendlychat-web" rel="noreferrer">the repo</a>.  At step 7, I did what it said (though, actually, there was nothing to do here because the steps were already completed in the repo).  When I click the [SIGN-IN WITH GOOGLE] button in the UI, the auth window pops open and closes immediately.</p>
  
  <p>I'm developing in an Ubuntu Guest in VMWare.  The following domains are authorized for this app in the firebase console:</p>
  
  <ul>
  <li>localhost</li>
  <li>blahblah.firebaseapp.com</li>
  <li>127.0.0.1</li>
  <li>&lt; my guest ip ></li>
  <li>&lt; my host/public ip ></li>
  </ul>
  
  <p>The firebase website says ask here.  I <a href="https://github.com/firebase/friendlychat-web" rel="noreferrer">searched thouroughly</a> first, the (few) other posted solutions didn't work.</p>
  
  <p>Can anyone tell me why this is happening?</p>