diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/src/logging.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/src/logging.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+#if 0
+/* 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/. */
+#endif
+
+XPCOMUtils.defineLazyModuleGetter(this, "console",
+  "resource://gre/modules/devtools/Console.jsm");
+
+let gDebug = false;
+try {
+  gDebug = Services.prefs.getBoolPref(kPrefCustomizationDebug);
+} catch (e) {}
+
+function LOG(...args) {
+  if (gDebug) {
+    args.unshift(gModuleName);
+    console.log.apply(console, args);
+  }
+}
+
+function ERROR(...args) {
+  args.unshift(gModuleName);
+  console.error.apply(console, args);
+}
+
+function INFO(...args) {
+  args.unshift(gModuleName);
+  console.info.apply(console, args);
+}
+