This repo contains a Cordova project using the Ionic v3 framework which builds a test app for cordova-plugin-firebasex which is a fork of cordova-plugin-firebase that has been updated to fix several issues.
git clone https://github.com/dpa99c/cordova-plugin-firebasex-ionic3-test.git && cd cordova-plugin-firebasex-ionic3-test
npm install
ionic cordova platform add ios
ionic cordova run ios
ionic cordova platform add android
ionic cordova run android