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.
Nokia Lumia 700 in bright blue was stunning! I really liked it, the tiles were different and it felt funky. Pity they abandoned the project.