Today 10 years ago I went to Poland to buy a Phone with pre installed #Firefox OS on. The Phone was a Alcatel One, so very shitty. Two years later I installed Firefox OS on my Nexus 5 instead.
It was a very good concept, but sadly rolled out on too shitty hardware so it never caught on.
Aurora still works, but the anonymous accounts are all broken. They get throttled because of too many requests on the accounts which need to be manually generated.
I believe it works fine if you log in.