Statistics service whos.amung.us slips its ads on sites?

For about a month, he began to notice strange pop-up windows on his site. And the windows appeared only 2-3 times a day, completely unpredictable after clicking on any of the links. Immediately I thought that I had broken the site and slipped the iframe into the code of the pages, but the search for the word iframe did not give anything.
I had to look for the problem in the connected scripts and what was my surprise when I found the code that adds a bunch of nasty things to my page. It turned out that all this is due to the whos.amung.us statistics counter . Look at this script!

Honestly, I did not expect this from them.