Some people seem gleeful about this, but Firefox OS is actually an excellent Smart TV OS, especially at a time where a lot of manufacturers feel comfortable inserting ads into people's TVs without their consent.
It's obviously ridiculous that this is something we need to deal with in the first place, but I'm definitely happy that I got one of the few TVs without a scummy OS.
The smartphone OS was always a vague idea that never materialized into anything. Part of that was probably a result of the frustration that we never really got that Nokia OS for lower-end devices. Instead we're left with Android.
I plan on making the TV OS a big parameter for the TVs I buy in the future. (Which feels about just as dumb as doing the same with future microwave ovens, but this is the world we live in.)
Fortunately I won't be buying a new TV within the next three years. I've genuinely been wondering whether I need to set up an intermediary Raspberry Pi ad-blocker to safeguard my Internet of nonsense at home.