I have been testing Tor Browser and Mullvad Browser using fingerprint.com. I get unique persistent identifiers that are unique per machine and persist over rebooting sessions. Javascript was on during this test.
This could be very dangerous to people using Tor Browser and Mullvad Browser.
For example, if someone visits Rainbow Railroad, an organization for leaving repressive countries with hostile LGBT policies, and then watches a video about the organization on YouTube, and then also does something, like create a Discord Server, and use Tor Browser to get around geoblocking but link it to their personal phone number, then a hostile regime buying data from data brokers could possible determine that user is considering using rainbow railroad. Even if this exact example isn’t realistic or plausible (although governments do buy form data brokers), users should be aware that persistent identifiers in Tor Browser and Mullvad Browser allow for continuous tracking of a user using the same machine.
I posted this information on privacyguides forum and they deleted my account after, leading me to wonder if the forum is a giant honeypot that curates acceptable privacy discussions and unacceptable private discussions. I honestly wonder if they are infiltrated by the government. They repeatedly delete the posts of other people as well and the whole thing is starting to not sit well with me.
“Javascript was on during this test.”
I understand: Javascript is not safe. I know that. But most of the internet, except for onions, use javascript and it’s nearly impossible to use most of the Internet in web browsers without it. The problem is that if Fingerprint.com can reliable detect differences between users when javascript is on for Mullvad Browser and Tor Browser in certain operating systems, users should be aware. Most people would think Mullvad Browser in “safer” mode would not create a persistent per-computer hash of the browser that can be tracked across sessions.