Chrome extensions spying on users' browsing data
qcontinuum.substack.com
February 11, 2026
11 min read
Summary
An automated scanning pipeline identified 287 Chrome extensions that exfiltrate browsing history, collectively installed on approximately 37.4 million devices. This represents around 1% of the global Chrome user base.
Key Takeaways
- An automated scanning pipeline identified 287 Chrome extensions that exfiltrate browsing history, collectively installed on approximately 37.4 million devices.
- The extensions flagged for data leakage are linked to various actors, including Similarweb, Curly Doggo, and Chinese data brokers.
- The methodology used for detection involved monitoring outbound traffic and correlating it with URL lengths to identify potential data leaks.
- The findings highlight ongoing concerns about privacy and data exfiltration through seemingly innocuous browser extensions.
Community Sentiment
NegativePositives
- Using open source extensions like uBlock Origin allows users to audit the code, enhancing trust and security in their browsing experience.
- The ability to research and monitor updates for extensions can help users protect themselves from potential data exfiltration.
Concerns
- The Chrome Web Store's lack of regulation enables bad actors to purchase legitimate extensions and exploit user data.
- There is a growing concern that even trustworthy extensions can become malware after being bought out, eroding user trust.
Source
qcontinuum.substack.com
Published
February 11, 2026
Reading Time
11 minutes
Relevance Score
67/100
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