However, if you leave the "test with a real tracking company" option enabled, Cover Your Tracks will use a real resource from a third-party tracker for some tests in order to determine whether your ad blocker or privacy tool allows whitelisted resources, such as those under the so-called "Acceptable Ads" program to unblock those trackers. Your browser sends very limited information during these test, such as a request for a 'favicon', with referrers disabled where possible. We believe that in most cases, trackers will learn nothing useful from this request, though some unblocked trackers might be able to guess you were visiting Cover Your Tracks as a result of it.