If you can't find that ad blocker you recently installed from the Chrome Web Store, you might want to do some browser spring cleaning. Google has killed five top-ranking ad blockers after AdGuard published a report revealing they're fake extensions with extra code that harvest info on the websites you visit. They apparently send the data they collect to remote servers in order to manipulate Chrome's behavior. "Basically, this is a botnet composed of browsers infected with the fake adblock extensions," AdGuard wrote in its report. "The browser will do whatever the command center server owner orders it to do."