I was checking my site in Firefox, and I scrolled to the bottom of the page. Below, where the website is supposed to stop, a 728x90 advert appeared.
Apart from the fact that I do not use 728x90 adverts on that page, and it appeared below where the site ends, I thought I may have been hacked.
I looked at the code, and nothing was there. (It's all html)
I checked other sites that I know run adsense, and the same thing happened.
The ad choices arrow took me to the Evidon site.
Malwarebytes didn't find anything, and even before it finished the scan, I opened up FF again, but this time they did not appear.
I've only been to a handful of trusted sites today, and the cache was clear before I started, so I have no idea where or how this has happened. And if it has happened to me, it could be happening to others.
Juat a thought.