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.
Ah, nostalgic! I loved the Firefox OS! I even preached about it to family and friends. Good times.
Unfortunately it never felt like a finished product.