Google is adding code to Chrome that will send tamper-proof information about your operating system and other software, and share it with websites. Google says this will reduce ad fraud. In practice, it reduces your control over your own computer, and is likely to mean that some websites will block access for everyone who’s not using an “approved” operating system and browser. It also raises the barrier to entry for new browsers, something Google employees acknowledged in an unofficial explainer for the new feature, Web Environment Integrity (WEI).