A popular browser extension that helps personalize how a website looks has been found to be tracking user activity. The revelation has pushed Google and Mozilla to remove the Stylish browser extension from their app stores. However, the extension’s official website still remains active.
Software engineer Robert Heaton claimed in a blog post that the Stylish extension tool steals a user’s internet history and sends information about a person’s browsing history and distinct identifiers to SimilarWeb, the extension’s owner. According to Heaton, this will allow the company to “connect all of an individual’s actions into a single profile.”
Heaton further explained that Stylish account holders typically have a unique identifier that can be linked to a login cookie. This will then provide SimilarWeb with enough information to “theoretically tie these histories to email addresses and real-world identities.”
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