I believe it also depends on your location. I only see sponsored tiles when traveling in some countries.

"Sponsored shortcuts" comes enabled by default, at least on Windows builds made by Mozilla. If you are using Linux I suppose your distro turns it off by default?

btw in my case it adds two ads: Nike and Amazon. They come with tracking parameters that are unique to me (if I create a new browser profile, they change)

Disabling them is one click away, however.

I'm going to be pedantic and point out that it's two clicks if we count the one to pull up the settings pane in the first place