Not that I know of.<p>EDIT: reading the firefox bug for this test implementation, I&#x27;m not sure if it is intended to be applied to pages, or only to sub-resources (early posts mention the distinction, later ones don&#x27;t)<p><a href="https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1267474" rel="nofollow">https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1267474</a>