How to watch Youtube videos without ads and interruption besides subscribing to it?

The orthodox solution is to use Youtube Vanced. It works perfectly, it’s Youtube Premium with all it’s features plus more and for free. Although it comes with a price. While I think it is fully open-source, you still have to install multiple binaries from outside the store. And in my case there was suspicious high battery usage from those apps even when they weren’t opened for days. A red flag and at least a problem for practical reasons.

The alternative that I found most straight forward was to simply use Firefox for Android coupled with uBlock Origin and Video Background Play Fix addons. Not as nice as Vanced but works without fuss.