diff -r 000000000000 -r 6474c204b198 toolkit/devtools/tests/unit/test_independent_loaders.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/tests/unit/test_independent_loaders.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Ensure that each instance of the Dev Tools loader contains its own loader
+ * instance, and also returns unique objects.  This ensures there is no sharing
+ * in place between loaders.
+ */
+function run_test() {
+  let loader1 = new DevToolsLoader();
+  let loader2 = new DevToolsLoader();
+
+  let color1 = loader1.require("devtools/css-color");
+  let color2 = loader2.require("devtools/css-color");
+
+  do_check_true(color1 !== color2);
+
+  do_check_true(loader1._provider !== loader2._provider);
+  do_check_true(loader1._provider.loader !== loader2._provider.loader);
+}