added a time cause FF seems to discard cookies without a timestamp immediately against specification

threadr/accept_cookie.php

@@ -1,5 +1,5 @@
 <?php
-setcookie('threadr_cookie_banner');
+setcookie('threadr_cookie_banner', $expires=time()+2592000);
 //header("Location: https://$_SERVER[HTTP_HOST]" . urldecode($_GET['from']));
 
 print_r($_COOKIE)