Supabase is an open source Firebase alternative. Start your project with a Postgres database, Authentication, instant APIs, Edge Functions, Realtime subscriptions, and Storage.

Supabase

When selecting any provider for auth, why do I need to add the client ID and secret? Stuff like this was automatically configured in firebase, right?

No you have to enter these for firebase too, there is no way for it to know the details of your third party auth provider.

yes, just checked. I must be mistaken. Thanks

but I guess firebase does not need that for google sign in? https://firebase.google.com/docs/auth/web/google-signin

That would probably be because you have to setup your firebase account with Google console, so it already knows those details.