On the internet, it’s easy to feel anonymous. If you don’t log in, no one can see who you are; you can even switch to incognito mode. The more savvy user would say that’s not really enough. To be anonymous, you need to clear your cookies and use a privacy-oriented browser.

But new research shows even that doesn’t work anymore. Websites are still tracking you — silently, persistently, and without your consent — by reading your browser’s unique “fingerprint.”