Connect login and register form in firebase

[TIMAI2]

@moemen

As an app maker, don't I have the right to see the data after stored

You have the right to look after your users privacy....
Firebase does not present an authenticated user's password anywhere, you would have to get it from the app

@moemen

If i want to make a button when user forget his password , dont i need them with me in firedatabase?

Firebase REST API provides a routine for this:
https://firebase.google.com/docs/reference/rest/auth#section-send-password-reset-email

However, if you want to try something different, this may be more to your liking and provide you with more control:

"Subvert" Firebase Authentication or (One Authenticated User for Multiple User Logins)

[firebaselogo] This one has been tinkling about in my head for a few months, finally got around to committing it to "paper". In essence, this guide demonstrates how to use one firebase authenticated user to authenticate your app with Firebase with secure rules, and to then allow the sign up and sign in of users, who can have a range of read / write permissions, depending on how you setup your app. AIA file now provided. Subvert Firebase Authentication