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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=837060
+
+When we use Debugger.Object.prototype.executeInGlobal, the 'this' value seen
+by the evaluated code should be the WindowProxy, not the inner window
+object.
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Mozilla Bug 837060</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+</head>
+<body>
+<pre id="test">
+<script>
+"use strict";
+
+const {addDebuggerToGlobal} = ChromeUtils.importESModule("resource://gre/modules/jsdebugger.sys.mjs");
+addDebuggerToGlobal(globalThis);
+
+window.onload = function() {
+  SimpleTest.waitForExplicitFinish();
+
+  const iframe = document.createElement("iframe");
+  iframe.src = "data:text/html,<script>var me = 'page 1';<\/script>";
+  iframe.onload = firstOnLoadHandler;
+  document.body.appendChild(iframe);
+
+  function firstOnLoadHandler() {
+    const dbg = new Debugger();
+    const page1DO = dbg.addDebuggee(iframe.contentWindow);
+    iframe.src = "data:text/html,<script>var me = 'page 2';<\/script>";
+    iframe.onload = function() {
+      const page2DO = dbg.addDebuggee(iframe.contentWindow);
+      ok(page1DO !== page2DO, "the two pages' globals get distinct D.O's");
+      ok(page1DO.unsafeDereference() === page2DO.unsafeDereference(),
+         "unwrapping page1DO and page2DO outerizes both, yielding the same outer window");
+
+      is(page1DO.executeInGlobal("me").return,
+         "page 1", "page1DO continues to refer to original page");
+      is(page2DO.executeInGlobal("me").return, "page 2",
+         "page2DO refers to current page");
+
+      is(page1DO.executeInGlobal("this === window").return, true,
+         "page 1: Debugger.Object.prototype.executeInGlobal should outerize 'this'");
+      is(page1DO.executeInGlobalWithBindings("this === window", {x: 2}).return, true,
+         "page 1: Debugger.Object.prototype.executeInGlobal should outerize 'this'");
+
+      is(page2DO.executeInGlobal("this === window").return, true,
+         "page 2: Debugger.Object.prototype.executeInGlobal should outerize 'this'");
+      is(page2DO.executeInGlobalWithBindings("this === window", {x: 2}).return, true,
+         "page 2: Debugger.Object.prototype.executeInGlobal should outerize 'this'");
+
+      // Debugger doesn't let one use outer windows as globals. You have to innerize.
+      const outerDO = page1DO.makeDebuggeeValue(page1DO.unsafeDereference());
+      ok(outerDO !== page1DO,
+         "outer window gets its own D.O, distinct from page 1's global");
+      ok(outerDO !== page2DO,
+         "outer window gets its own D.O, distinct from page 2's global");
+      SimpleTest.doesThrow(() => outerDO.executeInGlobal("me"),
+                           "outer window D.Os can't be used as globals");
+
+      SimpleTest.finish();
+    };
+  }
+};
+</script>
+</pre>
+</body>
+</html>