Firebase Web Hosting
Spencer Easton shows how resources like images and stylesheets can be put on Firebase Hosting and used in Apps Script projects. In this example Spence uses the command line interface (CLI) in his operating system but if you are developing on Chromebooks you can use a cloud service such as Cloud9 (c9.io).
Introduction to Firebase Databases in Google Apps Script
In this clip from Totally Unscripted Episode 8 Martin Hawksey provides a introduction to using Firebase Databases in Google Apps Script projects which includes basic setup and the process for writing/reading data. This tutorial is based on this Quickstart: Read and write data in Firebase from Apps Script
Real-time reporting from Firebase with Google Apps Script
Firebase Authentication Opportunities
Cloud Functions for Firebase in Google Apps Script
In this clip Riël Notermans introduces Cloud Functions for Firebase as a way to get around Google Apps Script quota limits. As part of this Riël shows all the steps needed to setup and deploy a cloud function from Firebase, demonstrating how they can be used to overcome the Apps Script 10MB UrlFetchApp payload limit.