litzaghitzalau

You're all just a bunch of pathetic haters. If you look carefully, you'll see that abs.twimg is responding with "access-control-allow-origin: *".

The reason you see CORS errors in the Network tab in Firefox when Enhanced Tracking is enabled, is because Firefox sux and can't render a correct error message. They simply have manual hardcoded lists for blacklisting, just because they have it (and probably they implement it by faking a CORS failure).