Firefox 59 to strip path information from referrer values for 3rd parties
In about:config, setting 'network.http.sendRefererHeader' to 0 (default is 2) will stop the referer header from being sent, and the document.referrer from being set. See <a href="http://kb.mozillazine.org/Network.http.sendRefererHeader" rel="nofollow">http://kb.mozillazine.org/Network.http.sendRefererHeader</a> for more information.