Firebase Security Rules Block Writing to Firebase

Question

Note: This question is tagged polymer because the Polymer library is used to generate the Javascript.

This question is about two different

Answer 1

@FrankvanPuffelen's answer in Polymer-speak translates into:

Use the element's .add() method to write data to Firebase from the client while under security rule enforcement. It's more efficient from a code standpoint as firebase-collection handles all the necessary auth tokens for you automatically.