How to change Geo for Yandex maps?

Question

Geolocation

Guys, welcome, such a question. There is a plugin for firefox that changes your Geo, yes, it works, it changes my coordinates to whatever I want. I check here https://benwerd.com/lab/geo.php
But if I try to find my location on the Yandex map, this change does not help. The browser shows my true position. I tried to change the geo through the config, it does not help either.
Yandex does not show the location by IP? And another interesting fact. I'm on a desktop computer (no gps), but if I update my location many times, it keeps changing by +/- 20 meters.