AdNauseum is a free, Google Chrome extension that the company banned from the Chrome Web Store in 2017.
The extension hides ads, like any number of ad blockers, but twists the knife by automatically clicking on any ads it finds. The intent is to render user targeting via ad surveillance pointless by flooding the ad surveillance software with false positives.
Two of the creators of the AdNauseum extension have written up an academic analysis of their project here.