If the current page should have a service worker, you could look for errors in the <a>Console</a> or step through your service worker registration in the <span>Debugger</span>.
Hdy by aktualna strona service worker měła, móhł wy w <a>konsoli</a> za zmylkami pytać abo registraciju swojeho service worker w <span>pytanju za zmylkami</span> přeběžeć.