title: How to subscribe on localStorage but not on sessionStorage events
body: <p>As far as I understand:</p>
  
  <pre><code>window.addEventListener('storage', function(event){
         ...
  }, false);
  </code></pre>
  
  <p>is subscription on both localStorage and sessionStorage events.
  Can I subscribe on localStorage events only?</p>
  
  <p>Thanks.</p>