It makes a little bit of sense. When you come from a https site, you don't want to leak referrer (and thus which part of which site you were visiting) over the

It makes a little bit of sense. When you come from a https site, you don't want to leak referrer (and thus which part of which site you were visiting) over the unencrypted internet. Though in my eyes sending referrers always has been questionable "insecure by default" behavior, as the internal structure of one site is leaked to another. With hindsight, maybe it should have been restricted to the domain name.