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diff --git a/tools/addon-sdk-1.12/lib/sdk/l10n.js b/tools/addon-sdk-1.12/lib/sdk/l10n.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";
+
+module.metadata = {
+  "stability": "stable"
+};
+
+const core = require("./l10n/core");
+const { getRulesForLocale } = require("./l10n/plural-rules");
+
+// Retrieve the plural mapping function
+let pluralMappingFunction = getRulesForLocale(core.language()) ||
+                            getRulesForLocale("en");
+
+exports.get = function get(k) {
+  // For now, we only accept a "string" as first argument
+  // TODO: handle plural forms in gettext pattern
+  if (typeof k !== "string")
+    throw new Error("First argument of localization method should be a string");
+
+  // Get translation from big hashmap or default to hard coded string:
+  let localized = core.get(k) || k;
+
+  // # Simplest usecase:
+  //   // String hard coded in source code:
+  //   _("Hello world")
+  //   // Identifier of a key stored in properties file
+  //   _("helloString")
+  if (arguments.length <= 1)
+    return localized;
+
+  let args = arguments;
+
+  if (typeof localized == "object" && "other" in localized) {
+    // # Plural form:
+    //   // Strings hard coded in source code:
+    //   _(["One download", "%d downloads"], 10);
+    //   // Identifier of a key stored in properties file
+    //   _("downloadNumber", 0);
+    let n = arguments[1];
+
+    // First handle simple universal forms that may not be mandatory
+    // for each language, (i.e. not different than 'other' form,
+    // but still usefull for better phrasing)
+    // For example 0 in english is the same form than 'other'
+    // but we accept 'zero' form if specified in localization file
+    if (n === 0 && "zero" in localized)
+      localized = localized["zero"];
+    else if (n === 1 && "one" in localized)
+      localized = localized["one"];
+    else if (n === 2 && "two" in localized)
+      localized = localized["two"];
+    else {
+      let pluralForm = pluralMappingFunction(n);
+      if (pluralForm in localized)
+        localized = localized[pluralForm];
+      else // Fallback in case of error: missing plural form
+        localized = localized["other"];
+    }
+
+    // Simulate a string with one placeholder:
+    args = [null, n];
+  }
+
+  // # String with placeholders:
+  //   // Strings hard coded in source code:
+  //   _("Hello %s", username)
+  //   // Identifier of a key stored in properties file
+  //   _("helloString", username)
+  // * We supports `%1s`, `%2s`, ... pattern in order to change arguments order
+  // in translation.
+  // * In case of plural form, we has `%d` instead of `%s`.
+  let offset = 1;
+  localized = localized.replace(/%(\d*)(s|d)/g, function (v, n) {
+      let rv = args[n != "" ? n : offset];
+      offset++;
+      return rv;
+    });
+
+  return localized;
+}