Google’s Chrome ad blocker means the Web’s largest ad company is also now advertising’s biggest traffic cop

Google, one of the dominant players in the online advertising world, may soon have even more power in that space. It is now taking on the challenge of determining what’s a good ad or a bad ad and deciding which ones the majority of Web users will see.

Google’s Chrome browser, which is used by about 60 percent of desktop and mobile Internet users, on Thursday began the process of blocking some of the Web’s most annoying ads. Those include video ads that autoplay with sound, pop-up ads with countdowns and “sticky” ads that take up a large portion of the screen no matter how far you scroll down to try to lose them.