I'm not familiar with Firebase, but I guess with a little bit of coding its totally feasible.
I build real-time apps with Meteor, which uses MongoDB and its oplog, however Meteor is on decline in popularity these days.
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I worked a few months with Firebase (check out http://app.zentasktic.com), it's quite similar with Mongo but much faster. It's now integrated into the Google full stack of services (analytics, push notifications, admob, etc).
I'm afraid its out of my scope (I don't use any Google services, willingly at least). I would prefer to stick to open-source, self-hostable solutions for data storage.
Perhaps RethinkDB could be a candidate here?
Got it :)