title: window.opener is null after redirect
body: <p>I am opening a paypal window from the parent with <code>window.open()</code>. After payment and redirecting back to my page (in the popup window), I would like to close the popup and update the parent window URL.</p>
  
  <p>I found out this works over window.opener.location.</p>
  
  <p>However the console shows </p>
  
  <blockquote>
    <p>window.opener.location is null</p>
  </blockquote>
  
  <p>after redirection because as the child window changes, the popup looses the information about the opener.</p>
  
  <p>Well great. Now is there any way to get around this? Maybe adding a sort of "listener" to the parent who listens to the URL of the child?</p>