Helpful showing all data websites / trackers can gather about you:
https://ipleak.net/
via my new browser experiment: LibreWolf (custom version of FireFox)
https://librewolf.net/
I am learning about RFP (Resist Fingerprinting)
https://librewolf.net/docs/faq/#what-are-the-most-common-downsides-of-rfp-resist-fingerprinting