- Install brand new Windows 7 in VirtualBox
- install Firefox
- Select public anonymous proxy that I have never used before
- Open Firefox, set anonymous HTTP proxy, set
geo.enabled = falsein
http://www.google.ru/, write query
Through this way, Google still knows my real location. The only way to hide it is telling Firefox to use a SOCKS5 proxy.
System-wide anonymous HTTP proxy setting (via Internet Options) works the same way. Google sees my real location.
Problem solved. See my answer.