- [google annoucement](https://developers.google.com/web/updates/2018/06/a2hs-updates) - [google doc about install](https://developers.google.com/web/fundamentals/app-install-banners/) - [firefox doc](https://developer.mozilla.org/en-US/Apps/Progressive/Add_to_home_screen#How_do_you_make_an_app_A2HS-ready)
