Ad fraud activity is highest on certain browsers made by Microsoft Corp. and Alphabet Inc.’s Google, according to research by ad fraud detection company FraudLogix.

Fraudsters can manipulate consumers’ web browser software for their financial gain by infecting browsers with malicious code and forcing them to load certain webpages. For advertisers this is bad news, since they can wind up paying for ads which can never actually be seen by real people.

Read the full article at the Wall Street Journal website.