San Francisco: A newly discovered spyware effort attacked users through 32 million downloads of extensions to Google’s market-leading Chrome web browser, researchers at Awake Security told Reuters, highlighting the tech industry’s failure to protect browsers as they are used more for email, payroll and other sensitive functions. Alphabet Inc’s Google said it removed more than 70 of the malicious add-ons from its official Chrome Web Store after being alerted by the researchers last month . “When we are alerted of extensions in the Web Store that violate our policies, we take action and use those incidents as training material to improve our automated and manual analyses,” Google spokesman Scott Westover told Reuters. Most of the free extensions purported to warn users about questionable websites or convert files from one format to another. Instead, they siphoned off browsing history and data that provided credentials for access to internal business tools. Based on the number of downloads, it was the most far-reaching malicious Chrome store campaign to date, according to Awake co-founder and chief scientist Gary Golomb. Google declined to discuss how the latest spyware compared with prior campaigns, the breadth of the damage, or why it did not detect and remove the bad extensions on its own despite past promises to supervise offerings more closely. It is unclear who was behind the effort to distribute the malware. Awake said the developers supplied fake contact information when they submitted the extensions to Google. “Anything that gets you into somebody’s browser or email or other sensitive areas would be a target for national espionage as well as organized crime,” said former National Security Agency engineer Ben Johnson, who founded security companies Carbon Black and Obsidian Security. The extensions were designed to avoid detection by antivirus companies or security software that evaluates the reputations of web domains, Golomb said. If someone used the browser to surf the web on a home computer, it would connect to a series of websites and transmit information, the researchers found. Anyone using a corporate network, which would include security services, would not transmit the sensitive information or even reach the malicious versions of the websites.