I wrote this guide about how to install firebase analytics in godot because I struggled and it may be useful for the future me and others.
This guide explains how to install the nativelib Addon: https://drmoriarty.github.io/nativelib/guide/gui-usage.html#installation
In short:
- In the top bar of Godot click on
AssetLib
next to2D, 3D, Script
- Look for
NativeLib
and install it