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Today 10 years ago I got a Firefox OS phone
(jemmy.jeena.net)
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.
Not exactly an answer to your question, but it does discuss Sailfish a little and is pretty interesting: https://youtu.be/HzCMKbhK-EY
Here is an alternative Piped link(s): https://piped.video/HzCMKbhK-EY
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I'm open-source, check me out at GitHub.