title: Firebase authenticating the user even if the facebook app that provided permissions is removed
body: <p>I am using <a href="https://rnfirebase.io/" rel="nofollow noreferrer">https://rnfirebase.io/</a> for react native application. I am successfully able to log in the user using Facebook Login.</p>
  
  <p>My question is, once I have logged in the user using facebook, and then I am deleting the app from my facebook profile that gave permissions to firebase, the firebase is still authenticating me. </p>
  
  <p>So, in this way, I will always be authenticated until I signout? Is this correct? or should I request for fresh Access Tokens ?</p>
  
  <p>Here is the code I am using to check if the user is logged in</p>
  
  <pre><code>  _bootStrap = () =&gt; {
          let route = Home;
          firebase.auth().onAuthStateChanged(user =&gt; {
              saveDataInAsyncStorage('userLoginInfo', user);
              this._navigate(route, result);
          });
    }
  </code></pre>