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.
You can still get phones like the pixel 7a, which has thick bezels, so I'd say they aren't completely gone from the market yet.
Unfortunately they still won't put in a headphone jack which is a deal breaker for me. It's a real shame because i would otherwise really like a pixel phone.
My Pixel 4a 5G has a headphone jack.