Android, Firebase Auth, user session still exists when user deletes and reinstall app

Question

In my first launching activity there is lines of code that checks if user is logged in by Firebase:

    if (mAuth.getCurrentUser() != null) {
                        


        

Answer 1

Firebase support answered me and yes Firebase tries to keep some data even if appliaction is deleted.

In order to clear data when deleteing, I needed to disable backuping in my applications manifest in application:

android:allowBackup="false"
android:fullBackupContent="false"