diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-getNewestFrame-03.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-getNewestFrame-03.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// Debugger.prototype.getNewestFrame() ignores dummy frames.
+// See bug 678086.
+
+var g = newGlobal();
+g.f = function () { return dbg.getNewestFrame(); };
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+var fw = gw.getOwnPropertyDescriptor("f").value;
+assertEq(fw.call().return, null);