"Malware and adware vendors have caught wind of this and have started showing up at the doors of extension authors, looking to buy their extensions. Once the deal is done and the ownership of the extension is transferred, the new owners can issue an ad-filled update over Chrome's update service, which sends the adware out to every user of that extension."
http://arstechnica.com/security/2014...illed-updates/
http://www.reddit.com/r/technology/c...ut_by_malware/