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.
For the curious people, Firefox OS kept living in a way, being used as the foundation for KaiOS, which was a smart operative system for “dumb” phones. This one took off in certain parts of the world.