Open-source tests of web browser privacy.
[EDIT] - Check the comments for more information and links π½ π½ π½
[Edit Edit] - Brave Browser caught adding its own referral codes to some cryptocurrency trading sites - More in the comments π½ π½ π½
Firefox generates a modified user profile by anonymizing data collected from multiple users. A more technical explanation can be found here:
https://blog.mozilla.org/security/2020/01/07/firefox-72-fingerprinting/
https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting