title: Is polymer server push manifest at build time useful with Firebase or is firebase.json does the job?
body: <p>I have notice that I can generate a push manifest in build process of my Polymer app but I am using Firebase as backend and I am trying to get h2 push to work. </p>
  
  <p>Would I need to worry about this push-manifest.json or is it enough to fill in firebase.json like <a href="https://github.com/Polymer/hn-polymer-2/blob/master/firebase.json" rel="nofollow noreferrer">here</a>? </p>