I'm from Germany.

It doesn't help. I entered my Austin, Texas (for testing purposes) data and was located using https://whatismyipaddress.com/, and it showed me in Germany, even though geo.de was changed.

I then investigated and found out that there are settings/scripts (on servers) that still send the data from the point of entry. While the exact location can't be determined, the country of origin can be identified.

Even with Tor, my home country was correctly displayed in 4 out of 10 cases.

I then used a VPN, and my country was displayed in 1 out of 10 cases.

So the claim that you don't leave any data when browsing via fake IPs or a VPN is a lie. Otherwise, the FBI, BKA, and other agencies wouldn't be able to track down and arrest people on the dark web. It's only a matter of time, and anyone who believes that Firefox, Chrome, VPNs, or internet providers don't have and send data from the original location is very gullible.