I need to instruct browsers visiting my site to send a blank referrer back to the site when navigating internally to defeat some tricky bots that have been plaguing us by automatically spoofing the referrer as us. To foil their access I am forcing a captcha on all reported internal referrals. Firefox is the only browser that insists on reporting the referrer, even when confronted with the meta tag not to. I am aware of the method to cause it to hide the referrer in local settings, but this doesn't help the random visitor. Does Firefox prefer another tag (I also tried "none", no luck)? Kind of stumped at it's refusal to cooperate with the standard header instruction. As far as I can tell all other browsers are cooperating.