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.
Same here; I've got mine in a box along with my Pixel XL, Nexus 5, and Moto X (which feels like a tiny Nexus 6). I tried the Nexus 6 for a few hours about a year ago, and it was still surprisingly snappy. I have a Note 20 Ultra for my daily driver, and it still feels small compared to the girth of the Nexus 6. I feel like I could possibly use it today, which is one of the reasons I keep it around, in case of an emergency.