Download the Construct 2 Firebase Leaderboard plugin by Rexrainbow. Documentation Please see here: https://c2rexplugins.weebly.com/rex_firebase_leaderboard.html
The RexRepo allows you to install all plugins and behaviors made by rexrainbow easily. In just a few clicks, the tool will download all (or the selected) plugins and behaviors from GitHub and installs them on your computer. The tool needs admin privilegs and an internet connection to work.