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Correct me if I’m wrong, but is it not still as simple as knowing the “chrome-extension://“ unique id of the extension? I’m aware of the cat and mouse aspect of scraping and that was one of the pitfalls I’ve been wary of as a fingerprinting vector.

I'd be surprised if sites had permission to read a chrome-extension:// URL. That'd be a sizable privacy leak.

I'm not sure about the chrome-extension protocol, but this API still seems to be present: https://developer.chrome.com/extensions/runtime#method-sendM...

I just tested in chrome 77, and I could only do `chrome.runtime.sendMessage("clngdbkpkpeebahjckkjfobafhncgmne", {},{},console.log)` from within the Stylus extension page, not from an external page like hacker news.

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