import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

devtools/client/shims/gDevTools.jsm

@@ -0,0 +1,35 @@
+/* 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";
+
+/**
+ * This file only exists to support add-ons which import this module at a
+ * specific path.
+ */
+
+const Cu = Components.utils;
+
+const { Services } = Cu.import("resource://gre/modules/Services.jsm", {});
+
+const WARNING_PREF = "devtools.migration.warnings";
+if (Services.prefs.getBoolPref(WARNING_PREF)) {
+  const { Deprecated } = Cu.import("resource://gre/modules/Deprecated.jsm", {});
+  Deprecated.warning("This path to gDevTools.jsm is deprecated.  Please use " +
+                     "Cu.import(\"resource://devtools/client/" +
+                     "framework/gDevTools.jsm\") to load this module.",
+                     "https://bugzil.la/912121");
+}
+
+this.EXPORTED_SYMBOLS = [
+  "gDevTools",
+  "gDevToolsBrowser"
+];
+
+const module =
+  Cu.import("resource://devtools/client/framework/gDevTools.jsm", {});
+
+for (let symbol of this.EXPORTED_SYMBOLS) {
+  this[symbol] = module[symbol];
+}

devtools/client/shims/moz.build

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+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+# Unlike most DevTools build files, this file does not use DevToolsModules
+# because these files are here for add-on compatibility, and so they must be
+# installed to previously defined locations.
+
+EXTRA_JS_MODULES.devtools += [
+    'gDevTools.jsm',
+]
+
+# Extra compatibility layer for transitional URLs used for part of 44 cycle
+EXTRA_JS_MODULES.devtools.client.framework += [
+    'gDevTools.jsm',
+]