Ok you have to walk me through here where are you seeing those site icons in the browser at?

WestEnd said

Ok you have to walk me through here where are you seeing those site icons in the browser at?

The question is about the about:newtab page. When I said 'site icons' I was referring to the tiles that have icons on the screenshot, like Google, Twitter, Reddit, Firefox.com etc. The question is about the other tiles that should have thumbnails but don't for some reason.