One morning, Agarwal got an e-mail offering “4 figures” for the sale of his Chrome extension. The extension was only about an hour’s worth of work, so Agarwal agreed to the deal, the money was sent over PayPal, and he transferred ownership of the extension to another Google account. A month later, the new extension owners released their first (and so far only) update, which injected adware on all webpages and started redirecting links. Chrome’s extension auto-update mechanism silently pushed out the update to all 30,000 Add to Feedly users, and the ad revenue likely started rolling in.