MrYar

// Turn off "Sends data to servers when leaving pages"
user_pref("beacon.enabled", false);

// Prevention of some telemetry related to the newtab
user_pref("browser.newtabpage.directory.ping", "");
user_pref("browser.newtabpage.directory.source", "");
user_pref("browser.newtabpage.enhanced", false);

// "In the release channels the Mozilla location service is used to help in figuring out regional search defaults."
// Which means sending collectable data