Freetube is the best way to watch YouTube
Customize YouTube to work exactly the way you want it to.
I'm using this all the time myself. There is no login to YouTube required and it supports adding subscriptions and doing everything important you can do on YouTube.
And the best part is no ads whatsoever.
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Yt in browser (ff+UBO) plays less than a minute, then stops. Freetube works. I hate google.
I use ff+uBO, and all works, never saw an ad. I am also using a VPN that blocks/filter ads, that might help.
I don't see ads. The video just stops and will not load last about one minute.