Comment by 3RTB297

18 months ago Google publicly stated they were going to start using browser fingerprint data to track users, a reversal of their 2019 policy on it because it was considered too invasive.

https://www.malwarebytes.com/blog/news/2025/02/google-now-al...

There's a fingerprint demo on github called JSCreep (https://abrahamjuliot.github.io/creepjs/) that used to keep your fingerprint profile for 90 days and show you how many times you visited. Worked extremely well, and is still around, but no longer uses the API to retain fingerprint data, so you have to track your hash yourself. It would easily track most browsers across changes in IP address. Only Mullvad, Brave, or Tor would not leave an easily tracked fingerprint.

The demo presented in the royfish.dev link is easily foiled by browser extensions that scramble fingerprint data, the presence of which would itself be detected by more sophisticated profilers and used to define the fingerprint. I can refresh the page and get a new hash and adjective-animal name with the same IP. JSCreep sticks firm to the same hash for me, even with a new IP address and some spoofed browser data.