Google and Mozilla have ejected the popular Stylish extension from their respective catalogs following a complaint that it collects data about website visits in a way that could be used to identify users.

The browser extension, which has about two million users, became a hit because it lets users put their own overlay on websites and hide features they don’t want to see.

Software engineer Robert Heaton detailed the extension’s demise from what he describes as a useful tool he’d used for several years to the privacy threat it is today.

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