Referers being sent from hidden service websites
Currently, when browsing on a hidden service website, when you click on a clearnet/hidden service link it sends the current address as referer.
I think Tor Browser should behave for websites on .onion addresses the same as https:// websites on clearnet in certain cases.
Normally, when you click on a http link from a https website, it doesn't send any referer.
Tor Browser should at least use this same behavior of https for http hidden services (both are encrypted right?). No referers should be sent to clearnet or to other hidden services, this is unacceptable. I believe it shouldn't send referers for https links as well, so send nothing at all.
Other than a partial solution, I still believe using the smart referer is a better solution overall.