diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-onNewGlobalObject-04.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-onNewGlobalObject-04.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+// onNewGlobalObject handlers only fire on enabled Debuggers.
+
+var dbg = new Debugger;
+var log;
+
+dbg.onNewGlobalObject = function (global) {
+  log += 'n';
+  assertEq(global.seen, undefined);
+  global.seen = true;
+};
+
+log = '';
+newGlobal();
+assertEq(log, 'n');
+
+log = '';
+dbg.enabled = false;
+newGlobal();
+assertEq(log, '');
+
+log = '';
+dbg.enabled = true;
+newGlobal();
+assertEq(log, 'n');