BTW: one of the reasons I wanted to disable my IP was that I tried to change the google doodle. So I logged out google. but doesnt matter which VPN country I choose and what I did in about:config and what Firefox language I choose -> the doodle doesn't change, it is always in my language, not in the VPN IP's language or in the Firefox's language.

The permissions.default.x preferences are the default site permission before you grant or deny a specific site. On the Settings page, if you go to Privacy, Location, and click the Settings button, you'll find a checkbox labeled "Block new requests asking to access your location" which has this effect:

• [ ] not checked => Sites can trigger a permission request => 0
• [x] checked => Sites cannot trigger a permission request => 2 -- you can still grant a site permission manually using the Page Info dialog (Ctrl+i, or on Mac, Command+i)

I think a value of 1 means you have granted permission for all sites by default, without an individual request, so that's normally NOT what you want.

geo.enabled controls whether Firefox will perform geolocation for a site even if you granted permission.

None of this is related to your IP address, it only controls precise location based either on GPS or your local Wi-Fi hotpots. If you want to use a different IP address, you generally need to use a VPN.

It's also possible Google determines your preferred language based on either:

• Language header -- see: Choose display languages for multilingual web pages
• Cookies or local storage from a previous visit -- try a private window after switching your IP and language

See

• https://searchfox.org/mozilla-release/source/netwerk/base/nsIPermissionManager.idl

 /**
  * Predefined return values for the testPermission method and for
  * the permission param of the add method
  * NOTE: UNKNOWN_ACTION (0) is reserved to represent the
  * default permission when no entry is found for a host, and
  * should not be used by consumers to indicate otherwise.
  */
 const uint32_t UNKNOWN_ACTION = 0;
 const uint32_t ALLOW_ACTION = 1;
 const uint32_t DENY_ACTION = 2;
 const uint32_t PROMPT_ACTION = 3;