Security researcher demonstrated two unpatched flaws that can be exploited to track millions of Internet users, allowing malicious website owners to track users. These two Browser Fingerprinting techniques abuse HTTP Strict Transport Security (HSTS) and Content Security Policy new security features already built into Mozilla Firefox and Google Chrome, and expected to make their ways to other mainstream browsers in near future. A researcher demonstrated how a website can track Google Chrome users even if they delete all cookies after every visit. A website can sniff a quick list of which secure sites a user has and hasn’t visited.
Source: https://thehackernews.com/2015/10/track-online-users.html