Firebase
To get started using Firebase, see how to set it up in quickstart.
Warning
You must be familiar with GDevelop Variable Callbacks to use this extension, as there is a heavy usage of those.
Firebase is a set of free services for developers: analytics, authentication of users, storage... While most of the services are free, some might require you to pay a Firebase subscription if you're using them a lot or over the free quota.
The services includes: