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diff --git a/MOZILLA_exports_init.js b/MOZILLA_exports_init.js
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+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/**
+ * This file is part of Haketilo.
+ *
+ * Function: Data structure to query items by URL patterns.
+ *
+ * Copyright (C) 2021 Wojtek Kosior
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you
+ * may distribute forms of that code without the copy of the GNU
+ * GPL normally required by section 4, provided you include this
+ * license notice and, in case of non-source distribution, a URL
+ * through which recipients can access the Corresponding Source.
+ * If you modify file(s) with this exception, you may extend this
+ * exception to your version of the file(s), but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * As a special exception to the GPL, any HTML file which merely
+ * makes function calls to this code, and for that purpose
+ * includes it by reference shall be deemed a separate work for
+ * copyright law purposes. If you modify this code, you may extend
+ * this exception to your version of the code, but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
+ * license. Although I request that you do not make use this code in a
+ * proprietary program, I am not going to enforce this in court.
+ */
+
+/* Polyfill for IceCat 60. */
+String.prototype.matchAll = String.prototype.matchAll || function(regex) {
+    if (regex.flags.search("g") === -1)
+        throw new TypeError("String.prototype.matchAll called with a non-global RegExp argument");
+
+    for (const matches = [];;) {
+        if (matches[matches.push(regex.exec(this)) - 1] === null)
+	    return matches.splice(0, matches.length - 1);
+    }
+}
+
+window.haketilo_exports = {is_mozilla: true, browser: this.browser};