title: Restrict Firestore gmail sign in to specific domain
body: <p>I want to restrict the users to be able to sign in in my Firestore application using the specific gmail domain. I found the similar question <a href="https://stackoverflow.com/questions/10858813/restrict-login-email-with-google-oauth2-0-to-specific-domain-name">here</a> but that is totally different from the Firestore. So let me explain my requirement what I want.</p>
  
  <p>Suppose one company called <code>abc.com</code> are using the gmail services and they have integrated their all email accounts to gmail. So they can use gmail email services using that account. So I want to restrict to users that only use the <code>username@abc.com</code> gmail account to login to my firestore app.</p>
  
  <p>I have searched a lot but didn't found any documentation about this.</p>