title: Firebase - Losing Auth Session After An Hour
body: <p>I added Firebase auth to my Reactjs (and Redux) web app and everything works perfectly.  I'm using email / password sign in, and call firebase.auth().signInWithEmailAndPassword which persists on reloads, tab changes, etc.  However, after about an hour, the auth session appears to expire and currentUser is set to null.  It feels like there should be a setting somewhere in the Firebase console, but after searching through it, I can't find anything.</p>
  
  <p>Any help would be really appreciated!</p>