I've had this problem as well when using a Tor proxy with Firefox. A page is displayed that says "Prove you're legit." Disabling other privacy plugins so I can

I've had this problem as well when using a Tor proxy with Firefox. A page is displayed that says "Prove you're legit." Disabling other privacy plugins so I can accept a tracking cookie isn't my idea of a fix. Is there a threat model that includes anybody in his right mind attacking HN?