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A security researcher identified 287 Chrome extensions with 37.4 million installations that exfiltrate browsing history data to over 30 companies, including Similarweb, Semrush, Alibaba, and ByteDance. The researcher developed an automated testing system using Docker and MITM proxies to detect history leakage by correlating outbound network requests with visited URLs. While some data collection is disclosed in privacy policies, users often don't realize they've consented to having their browsing data sold to data brokers. The findings highlight ongoing privacy concerns with browser extensions despite Google's Limited Use policy.

Security researcher finds 287 Chrome extensions leaking data