@Virgo It is always there, because I always clean my browser history and cookies and yes, I also often browse in private mode. Anyway I do not really care if it is there only sporadically, I want it gone forever, because it is my own private network, so there really is no reason at all for it to be there.

Currently I am using the Firemonkey extension to remove it with a script, but I do not understand why it is there in the first place. This is my private system, so it should be my responsibility if I want to show a cookie banner or not.