diff -r 000000000000 -r 6474c204b198 toolkit/devtools/tests/unit/test_invisible_loader.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/tests/unit/test_invisible_loader.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Cu.import("resource://gre/modules/jsdebugger.jsm");
+addDebuggerToGlobal(this);
+
+const COLOR_URI = "resource://gre/modules/devtools/css-color.js";
+
+/**
+ * Ensure that sandboxes created via the Dev Tools loader respect the
+ * invisibleToDebugger flag.
+ */
+function run_test() {
+  visible_loader();
+  invisible_loader();
+}
+
+function visible_loader() {
+  let loader = new DevToolsLoader();
+  loader.invisibleToDebugger = false;
+  loader.require("devtools/css-color");
+
+  let dbg = new Debugger();
+  let sandbox = loader._provider.loader.sandboxes[COLOR_URI];
+
+  try {
+    dbg.addDebuggee(sandbox);
+    do_check_true(true);
+  } catch(e) {
+    do_throw("debugger could not add visible value");
+  }
+}
+
+function invisible_loader() {
+  let loader = new DevToolsLoader();
+  loader.invisibleToDebugger = true;
+  loader.require("devtools/css-color");
+
+  let dbg = new Debugger();
+  let sandbox = loader._provider.loader.sandboxes[COLOR_URI];
+
+  try {
+    dbg.addDebuggee(sandbox);
+    do_throw("debugger added invisible value");
+  } catch(e) {
+    do_check_true(true);
+  }
+}