In my browser. If I setup Google public dns or cloudfare in Opera GX as DNS it works perfectly fine. The only downside is that I can’t access fritz.box anymore, I have to use the IP of my router to be able to access it, I just bookmarked it though.
In Firefox the dns settings dont work at all. If I disable dns I get the censoring screen, if I enable any of the dns settings Firefox always says it can’t reach the DNS service.