diff -r 000000000000 -r 6474c204b198 addon-sdk/source/lib/sdk/tabs.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/lib/sdk/tabs.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* 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": "unstable",
+  "engines": {
+    "Firefox": "*",
+    "Fennec": "*"
+  }
+};
+
+const { modelFor } = require("./model/core");
+const { viewFor } = require("./view/core");
+const { isTab } = require("./tabs/utils");
+
+
+if (require("./system/xul-app").is("Fennec")) {
+  module.exports = require("./windows/tabs-fennec").tabs;
+}
+else {
+  module.exports = require("./tabs/tabs-firefox");
+}
+
+const tabs = module.exports;
+
+// Implement `modelFor` function for the Tab instances.
+// Finds a right model by iterating over all tab models
+// and finding one that wraps given `view`.
+modelFor.when(isTab, view => {
+  for (let model of tabs) {
+    if (viewFor(model) === view)
+      return model;
+  }
+  return null;
+});