title: Email link that opens in existing tab if the domain is the same
body: <p>I have user registration process where at the end of it an email is sent to the registering user to confirm the user's email. The user then goes to his/her email and finds the email with the confirmation link. </p>
  
  <p>At this point the user has two tabs open (but can have more) - the email tab and the tab to my domain, lets call it <code>mydomain.com</code>.</p>
  
  <p>Is it possible, that when the user clicks the confirmation link in the email that the <code>mydomain.com</code> tab thats already open gets updated? </p>
  
  <p>Right now when the user clicks the confirmation link, a new tab to <code>mydomain.com</code> gets created, which creates two instances to the site, which is fine but not ideal. </p>
  
  <p>I know I can create a function that periodically checks if the user confirmed or open a websocket, but I am wondering if there is something simpler.</p>