diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-script-environment-nondebuggee.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-script-environment-nondebuggee.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+// The script and environment of a non-debuggee frame are inaccessible.
+
+load(libdir + 'asserts.js');
+
+var g = newGlobal();
+var dbg = new Debugger;
+
+var log;
+dbg.onDebuggerStatement = function (frame) {
+  log += frame.type;
+  // Initially, 'frame' is a debuggee frame, and we should be able to see its script and environment.
+  assertEq(frame.script instanceof Debugger.Script, true);
+  assertEq(frame.environment instanceof Debugger.Environment, true);
+
+  // If we make g no longer a debuggee, then trying to touch the frame at
+  // all show throw.
+  dbg.removeDebuggee(g);
+  assertThrowsInstanceOf(() => frame.script, Error);
+  assertThrowsInstanceOf(() => frame.environment, Error);
+}
+
+g.eval('function f() { debugger; }');
+
+log = '';
+dbg.addDebuggee(g);
+g.f();
+assertEq(log, 'call');
+
+log = '';
+dbg.addDebuggee(g);
+g.eval('debugger;');
+assertEq(log, 'eval');