I tried doing it but it blocked youtube video thumbnails, and I faced a lot of issues with adding domains, can you please tell me what is going on? I think I have no idea how to use it correctly but in the same sense I followed the steps in the link.
What I meant by "tried doing it" is that I followed the guide in your link => downloading the chrome extension that shows the domains list and whatsoever.
However, I reset it back to default and everything's OK now.