title: Is there any way to keep a person authenticated with firebase across subdomains
body: <p>I use firebase for authentication on my website and I want to keep the users auth session active across subdomains.</p>
  
  <p>Unfortunately, firebase uses Local Storage to store the user's session. Which unfortunately is independent to each subdomain.</p>
  
  <p>I already know that you can generate a JWT token using firebase from the server side, but then it doesn't allow the user to log out of the site because the user would still end up logged in other subdomains.</p>