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Security researchers built an automated scanning pipeline using Docker, MITM proxies, and correlation analysis to detect browser history exfiltration in Chrome extensions. The scan identified 287 extensions with ~37.4M users that leak browsing data to third parties including Similarweb, Curly Doggo, and Offidocs. The report includes technical details of the detection methodology, decryption examples showing how extensions obfuscate exfiltrated data (ROT47, AES-256, LZ-string compression), and honeypot evidence linking specific actors. Affected extensions range from ad blockers to productivity tools, with data being sold to analytics firms and potentially enabling corporate espionage.

Spying Chrome Extensions: 287 Extensions spying on 37M users