Why you shoud not use Firebase for your real-time chat. TLDR; Jabber is great
Many developers have fallen into the trap of using Firebase as a quick fix for real-time chat. With just a few lines of code, you can push messages to a database and have them sync across clients in real time. It’s a magical feeling – within an afternoon, you can get a basic chat working in your web or mobile app. No server code, no infrastructure headaches. Sounds too good to be true, doesn’t it?