When users SignOut of my Firebase app, why doesn't it also SignOut from the auth provider, say Google?

Question

I am using Google as the auth provider to sign in with my app. My code calls the Firebase sign out method which redirects to the login page, but when user again clicks on th

Answer 1

var provider = new Firebase.auth.GoogleAuthProvider();
  provider.setCustomParameters({
    prompt: 'select_account'
  });