Quick poll: Should CORS errors show up in the web console as warnings or errors? Or does it just not matter?
So that is a separate question: what constitutes "good" here? The current strings Firefox uses are https://searchfox.org/mozilla-central/rev/ea63a0888d406fae720cf24f4727d87569a8cab5/dom/locales/en-US/chrome/security/security.properties#11-26 … and seem a bit too verbose and clunky to me. Still trying to decide what those should look like.