> It uses SimHash, so any website a user visits on the Internet can reverse engineer the sites a Chrome user was on. How so? A user's cohort is shared by many

> It uses SimHash, so any website a user visits on the Internet can reverse engineer the sites a Chrome user was on. How so? A user's cohort is shared by many other users, and for any individual site you have visited it is very likely there will be another user with an identical cohort who has not visited that site. This means you cannot tell exactly which sites any individual has visited. > combined with just IP address its probably a 99+% precise user identifier. IP address alone is already a massive fingerprinting leak, and needs to be addressed if browsers are to prevent cross-site tracking. Chrome is also working on this: https://github.com/bslassey/ip-blindness https://github.com/bslassey/ip-blindness