Firebase is an app development platform, owned and supported by Google. Firebase helps developers launch serverless database.
These are the enterprise users that use Firebase.
Firebase extension: Firebase plugin for external APIs such as MailChimp, Stripe.
Firebase Extension Event: released 2022, add additional custom logic, code on 3rd party API. Event based, more customization on Firebase Extension. Additional Custom logic. Example firebase function, firebase extension event code snippet.
Firebase offerings : screenshot from firebase developer event by google
Firebase security rule testing. Example pseudo code : if request id == resource id can view, edit. Basically means if the creator of the object is equal to the requester of the object, go ahead and let them view and edit. Use Firebase emulator to develop and test.