title: Can I Unlink a Firebase user account in this scenario?
body: <p>I read the <a href="https://firebase.google.com/docs/reference/js/firebase.User#unlink" rel="nofollow noreferrer">Firebase User Docs</a> and the <a href="https://firebase.google.com/docs/auth/web/anonymous-auth" rel="nofollow noreferrer">Firebase  anonymous auth </a> and see there is an <code>Unlink</code>
  method on the User like:</p>
  <blockquote>
  <p>unlink ( providerId :  string ) : Promise &lt; User &gt;</p>
  </blockquote>
  <p>Is this possible to do even user is only signed in using one prover like Google?</p>
  <p>How does this work if user first is signed in Anonymously then linked to Facebook or Google provider?</p>