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diff --git a/src/js/contentscripts/dnt.js b/src/js/contentscripts/dnt.js
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+++ b/src/js/contentscripts/dnt.js
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+/*
+ * This file is part of Privacy Badger <https://www.eff.org/privacybadger>
+ * Copyright (C) 2018 Electronic Frontier Foundation
+ *
+ * Privacy Badger is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Privacy Badger is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Privacy Badger. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+function getPageScript() {
+
+ // code below is not a content script: no chrome.* APIs /////////////////////
+
+ // return a string
+ return "(" + function (NAVIGATOR, OBJECT) {
+
+ OBJECT.defineProperty(OBJECT.getPrototypeOf(NAVIGATOR), "doNotTrack", {
+ get: function doNotTrack() {
+ return "1";
+ }
+ });
+
+ OBJECT.defineProperty(OBJECT.getPrototypeOf(NAVIGATOR), "globalPrivacyControl", {
+ get: function globalPrivacyControl() {
+ return "1";
+ }
+ });
+
+ // save locally to keep from getting overwritten by site code
+ } + "(window.navigator, Object));";
+
+ // code above is not a content script: no chrome.* APIs /////////////////////
+
+}
+
+// END FUNCTION DEFINITIONS ///////////////////////////////////////////////////
+
+(function () {
+
+// don't inject into non-HTML documents (such as XML documents)
+// but do inject into XHTML documents
+if (document instanceof HTMLDocument === false && (
+ document instanceof XMLDocument === false ||
+ document.createElement('div') instanceof HTMLDivElement === false
+)) {
+ return;
+}
+
+// TODO race condition; fix waiting on https://crbug.com/478183
+chrome.runtime.sendMessage({
+ type: "checkDNT"
+}, function (enabled) {
+ if (enabled) {
+ window.injectScript(getPageScript());
+ }
+});
+
+}());