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diff --git a/browser/extensions/webcompat/lib/intervention_helpers.js b/browser/extensions/webcompat/lib/intervention_helpers.js
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index 0000000000..16ea6572f2
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+++ b/browser/extensions/webcompat/lib/intervention_helpers.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/* globals module */
+
+const GOOGLE_TLDS = [
+  "com",
+  "ac",
+  "ad",
+  "ae",
+  "com.af",
+  "com.ag",
+  "com.ai",
+  "al",
+  "am",
+  "co.ao",
+  "com.ar",
+  "as",
+  "at",
+  "com.au",
+  "az",
+  "ba",
+  "com.bd",
+  "be",
+  "bf",
+  "bg",
+  "com.bh",
+  "bi",
+  "bj",
+  "com.bn",
+  "com.bo",
+  "com.br",
+  "bs",
+  "bt",
+  "co.bw",
+  "by",
+  "com.bz",
+  "ca",
+  "com.kh",
+  "cc",
+  "cd",
+  "cf",
+  "cat",
+  "cg",
+  "ch",
+  "ci",
+  "co.ck",
+  "cl",
+  "cm",
+  "cn",
+  "com.co",
+  "co.cr",
+  "com.cu",
+  "cv",
+  "com.cy",
+  "cz",
+  "de",
+  "dj",
+  "dk",
+  "dm",
+  "com.do",
+  "dz",
+  "com.ec",
+  "ee",
+  "com.eg",
+  "es",
+  "com.et",
+  "fi",
+  "com.fj",
+  "fm",
+  "fr",
+  "ga",
+  "ge",
+  "gf",
+  "gg",
+  "com.gh",
+  "com.gi",
+  "gl",
+  "gm",
+  "gp",
+  "gr",
+  "com.gt",
+  "gy",
+  "com.hk",
+  "hn",
+  "hr",
+  "ht",
+  "hu",
+  "co.id",
+  "iq",
+  "ie",
+  "co.il",
+  "im",
+  "co.in",
+  "io",
+  "is",
+  "it",
+  "je",
+  "com.jm",
+  "jo",
+  "co.jp",
+  "co.ke",
+  "ki",
+  "kg",
+  "co.kr",
+  "com.kw",
+  "kz",
+  "la",
+  "com.lb",
+  "com.lc",
+  "li",
+  "lk",
+  "co.ls",
+  "lt",
+  "lu",
+  "lv",
+  "com.ly",
+  "co.ma",
+  "md",
+  "me",
+  "mg",
+  "mk",
+  "ml",
+  "com.mm",
+  "mn",
+  "ms",
+  "com.mt",
+  "mu",
+  "mv",
+  "mw",
+  "com.mx",
+  "com.my",
+  "co.mz",
+  "com.na",
+  "ne",
+  "com.nf",
+  "com.ng",
+  "com.ni",
+  "nl",
+  "no",
+  "com.np",
+  "nr",
+  "nu",
+  "co.nz",
+  "com.om",
+  "com.pk",
+  "com.pa",
+  "com.pe",
+  "com.ph",
+  "pl",
+  "com.pg",
+  "pn",
+  "com.pr",
+  "ps",
+  "pt",
+  "com.py",
+  "com.qa",
+  "ro",
+  "rs",
+  "ru",
+  "rw",
+  "com.sa",
+  "com.sb",
+  "sc",
+  "se",
+  "com.sg",
+  "sh",
+  "si",
+  "sk",
+  "com.sl",
+  "sn",
+  "sm",
+  "so",
+  "st",
+  "sr",
+  "com.sv",
+  "td",
+  "tg",
+  "co.th",
+  "com.tj",
+  "tk",
+  "tl",
+  "tm",
+  "to",
+  "tn",
+  "com.tr",
+  "tt",
+  "com.tw",
+  "co.tz",
+  "com.ua",
+  "co.ug",
+  "co.uk",
+  "com",
+  "com.uy",
+  "co.uz",
+  "com.vc",
+  "co.ve",
+  "vg",
+  "co.vi",
+  "com.vn",
+  "vu",
+  "ws",
+  "co.za",
+  "co.zm",
+  "co.zw",
+];
+
+var InterventionHelpers = {
+  /**
+   * Useful helper to generate a list of domains with a fixed base domain and
+   * multiple country-TLDs or other cases with various TLDs.
+   *
+   * Example:
+   *   matchPatternsForTLDs("*://mozilla.", "/*", ["com", "org"])
+   *     => ["*://mozilla.com/*", "*://mozilla.org/*"]
+   */
+  matchPatternsForTLDs(base, suffix, tlds) {
+    return tlds.map(tld => base + tld + suffix);
+  },
+
+  /**
+   * A modified version of matchPatternsForTLDs that always returns the match
+   * list for all known Google country TLDs.
+   */
+  matchPatternsForGoogle(base, suffix = "/*") {
+    return InterventionHelpers.matchPatternsForTLDs(base, suffix, GOOGLE_TLDS);
+  },
+};
+
+module.exports = InterventionHelpers;