Though these extensions were fully working as any other adblocker does by removing ads from web pages a user visits, the researchers caught them performing ' Cookie Stuffing' as an ad fraud scheme to generate revenue for their developers.Ĭookie Stuffing, also known as Cookie Dropping, is one of the most popular types of fraud schemes in which a website or a browser extension drops handfuls affiliate cookies into users' web browser without their permission or knowledge. uBlock by Charlie Lee - over 850,000 users.AdBlock by AdBlock, Inc - over 800,000 users.Apart from the extensions which are purposely created with malicious intent, in recent years we have also seen some of the most popular legitimate Chrome and Firefox extensions going rogue after gaining a massive user base or getting hacked.ĭiscovered by researchers at Adguard, the two newly caught Chrome extensions mentioned below were found using the names of two real and very popular ad-blocking extensions in an attempt to trick most users into downloading them.

Adblock google chrome extension