title: Service worker JavaScript update frequency (every 24 hours?)
body: <p>As per <a href="https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API" rel="noreferrer">this doc on MDN</a>:</p>
  
  <blockquote>
    <p>After that it is downloaded every 24 hours or so. It <em>may</em> be
    downloaded more frequently, but it must be downloaded every 24h to
    prevent bad scripts from being annoying for too long.</p>
  </blockquote>
  
  <p>Is the same true for Firefox and Chrome? OR does update to service worker javascript only happens when user navigates to site?</p>