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 said, highlighting the tech industry’s failure to protect browsers as they are used more for e-mail, payroll and other sensitive functions.

Alphabet’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 in May...

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