return;
	}

	/* Verify that we can register callbacks */
	if (!chrome.certificateProvider) {
		if (!GoogleSmartCard.IS_DEBUG_BUILD) {
			console.error("[cackey] This extension only works on ChromeOS!");

			console.info("[cackey] This extension's primary functionality only works on ChromeOS!  You won't be able to do much with it.");
			return;
		} else {
			console.log("[cackey] This extension only works on ChromeOS, but you appear to be debugging it -- trying anyway.");
		}
	}

	elementEmbed = document.createElement('embed');
	elementEmbed.type = "application/x-pnacl";
	elementEmbed.width = 0;
	elementEmbed.height = 0;