In TorBroswer 7.0a4, when leaving a .onion page for a clearnet page, the .onion address is sent as referrer. This should not be the case and has originally been disabled with [this commit](https://gitweb.torproject.org/tor-browser.git/commit/?h=tor-browser-45.8.0esr-6.5-2&id=09188cb14dfaa8ac22f687c978166c7bd171b576) and appears to have been [uplifted to Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=1305144) since. The `network.http.referer.hideOnionSource` preference is set to `true` but seems to have no effect. Steps to reproduce: 1. Go to [duckduckgo's onion page](https://3g2upl4pq6kufc4m.onion/) 2. enter any search term 3. click on one of the result 4. open the inspector observe the .onion referrer being send to the target page **Trac**: **Username**: pege