title: Firebase User Profile Add Custom Fields
body: <p>Is it possible to add custom fields to the user profile table in Firebase?</p>
  
  <p>Right now it looks like I can only add data to: </p>
  
  <ul>
  <li>"uid"</li>
  <li>"displayName"    </li>
  <li>"photoURL"    </li>
  <li>"email"    </li>
  <li>"emailVerified"   </li>
  <li>"phoneNumber"    </li>
  <li>"isAnonymous"    </li>
  <li>"tenantId"    </li>
  <li>"providerData":   </li>
  <li>"apiKey"    </li>
  <li>"appName"    </li>
  <li>"authDomain"    </li>
  <li>"stsTokenManager"    </li>
  <li>"redirectEventId"    </li>
  <li>"lastLoginAt"    </li>
  <li>"createdAt"</li>
  </ul>
  
  <p>I would like to have the ability to add custom objects to the JSON string to contain all of the user data.</p>
  
  <p><a href="https://firebase.google.com/docs/auth/web/manage-users" rel="noreferrer">https://firebase.google.com/docs/auth/web/manage-users</a></p>