If you block ALL traffic from it? Sure. It’s possible but more involved and requires the right hardware to block their tracking domains while leaving streaming apps working.
It’s best not to use smart TVs as well smart TVs. The apps they have are almost always slower or inferior in some way to the versions you get on streaming devices, updated less often, etc. I recommend pairing a TV with a quality streaming device like an Nvidia shield (or shield pro) or an AppleTV*. Alternatively if you want something a little cheaper in Androidtv space there is the Walmart brand Onn 4k pro.
*warning with Apple is while they’re pretty good on privacy (meh, there are no excellent choices that support streaming apps in 1080p quality) and don’t have ads their app-store is a bit more locked down. They have all the major streaming services but if you do high seas type stuff it will be more involved and difficult. Though if you have a local media collection (source your own discs or high seas) and run Plex or Jellyfin they have apps for both of those that work great as well as Infuse which usually requires a subscription unless you don’t need 4k or any proprietary audio codecs like dolby for any of your media. I personally can say I enjoy my AppleTV 4K and I think it’s a great device but I run my own media-server and have some common streaming services I pay for.
My problem with this in spite of the dire situation they face if Google is forced to cut funding by anti-trust court rulings (or not even forced but they make paying off Mozilla a moot point so they stop) is that they become an ad company. Ads become tied to their CEO compensation, to the salaries of the people who develop it.
They claim they’re making a better kind of ad network, a privacy respecting kind. The problem is the ad industry doesn’t want less data, they want more. There are no looming laws that would force the ad industry to adopt a more privacy respecting alternative or die and without that the ad industry is going to shun this and it’ll be a failure and then they’ll have a failed ad network that they can either discard entirely or adapt to industry standards of privacy invasion and abuse and continue to exist and then they’ll make another “hard choices” post about having to do that.
And I can see it now. This experiment will fail and after some pressure from the ad industry and some devil-on-shoulder whispering Mozilla will begrudgingly start to enshittify. Their ad network will become less privacy respecting by tiny little steps, by salami-slicing or boiling the frog, the whole privacy-preserving measurement thing will be thrown out BUT they’ll still claim they respect you more than Google and will at first perhaps but that will erode. Maybe they’ll just implode at some point after that which given Google is being found a monopoly works just fine for Google and the rest of big tech who want a more centralized, locked down browser company that wants to help implement DRM that can’t be circumvented, that wants to help lock down everything on the web to restrict users freedoms to choose what is displayed or if they can save it or record it or copy it to say nothing of blocking ads.