Link : Video.
1. Firebase Auth: provides simple login with Github, Google, Facebook, Twittr. Link
2. Manifest:
3. Generate Mainfest and icons: Link
4. Read-only offline cache:
5. What Web can do Today?: Link
Github: link
https://firebase.google.com/docs/auth/web/github-auth#redirect-mode
[Firebase + PWA] Keynote: Progressive Web Apps on Firebase
原文：http://www.cnblogs.com/Answer1215/p/5561930.html