You do not need to change your Fabric Crashlytics SDK or API key to migrate your app to Firebase Crashlytics. We are working on a streamlined Firebase Crashlytics SDK, and we will let you know when it is available. In order to get Crash Free User statistics as well as other services like Google Analytics for Firebase, you will need to add the Firebase Core SDK to your app.
“We’re really excited about Crashlytics being integrated into Firebase. Also with the outlook that we are working on new apps, it makes it much easier for our developers to have all of the data and all of the tools in one place.” – Gabriele Ottino, Doodle CEO