[randomString1]

There are several referer settings.

https://raw.githubusercontent.com/pyllyukko/user.js/master/u...

user_pref("network.http.referer.userControlPolicy", x);

// TODO: https://github.com/pyllyukko/user.js/issues/94, commented-out XOriginPolicy/XOriginTrimmingPolicy = 2 prefs

user_pref("network.http.referer.spoofSource", x);

user_pref("network.http.referer.XOriginPolicy", x);

[x775]

That is a very informative source, thank you!