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diff --git a/src/js/contentscripts/utils.js b/src/js/contentscripts/utils.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/>.
+ */
+
+/**
+ * Executes a script in the page's JavaScript context.
+ *
+ * @param {String} text The content of the script to insert.
+ * @param {Object} data Data attributes to set on the inserted script tag.
+ */
+window.injectScript = function (text, data) {
+ var parent = document.documentElement,
+ script = document.createElement('script');
+
+ script.text = text;
+ script.async = false;
+
+ for (var key in data) {
+ script.setAttribute('data-' + key.replace(/_/g, '-'), data[key]);
+ }
+
+ parent.insertBefore(script, parent.firstChild);
+ parent.removeChild(script);
+};
+
+function getFrameUrl() {
+ let url = document.location.href,
+ parentFrame = (document != window.top) && window.parent;
+ while (parentFrame && url && !url.startsWith("http")) {
+ try {
+ url = parentFrame.document.location.href;
+ } catch (ex) {
+ // ignore 'Blocked a frame with origin "..."
+ // from accessing a cross-origin frame.' exceptions
+ }
+ parentFrame = (parentFrame != window.top) && parentFrame.parent;
+ }
+ return url;
+}
+window.FRAME_URL = getFrameUrl();