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diff --git a/devtools/server/tests/chrome/test_makeGlobalObjectReference.html b/devtools/server/tests/chrome/test_makeGlobalObjectReference.html
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+++ b/devtools/server/tests/chrome/test_makeGlobalObjectReference.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=914405
+
+Debugger.prototype.makeGlobalObjectReference should dereference WindowProxy
+(outer window) objects.
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Mozilla Bug 914405</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 {addSandboxedDebuggerToGlobal} = ChromeUtils.importESModule("resource://gre/modules/jsdebugger.sys.mjs");
+addSandboxedDebuggerToGlobal(globalThis);
+
+window.onload = function() {
+  SimpleTest.waitForExplicitFinish();
+
+  // Load one of our iframes over http to force it in a different compartment
+  // from the current window and the other iframe.
+  const iframe = document.createElement("iframe");
+  const baseURL = "http://mochi.test:8888/chrome/devtools/server/tests/chrome/";
+  iframe.src = baseURL + "iframe1_makeGlobalObjectReference.html";
+  iframe.onload = iframeOnLoad;
+  document.body.appendChild(iframe);
+
+  function iframeOnLoad() {
+    const dbg = new Debugger();
+
+    // 'o' for 'outer window'
+    const g1o = iframe.contentWindow;
+    ok(!dbg.hasDebuggee(g1o), "iframe is not initially a debuggee");
+
+    // Like addDebuggee, makeGlobalObjectReference innerizes.
+    // 'i' stands for 'inner window'.
+    // 'DO' stands for 'Debugger.Object'.
+    const g1iDO = dbg.makeGlobalObjectReference(g1o);
+    ok(!dbg.hasDebuggee(g1o),
+       "makeGlobalObjectReference does not add g1 as debuggee, designated via outer");
+    ok(!dbg.hasDebuggee(g1iDO),
+       "makeGlobalObjectReference does not add g1 as debuggee, designated via D.O ");
+
+    // Wrapping an object automatically outerizes it, so dereferencing an
+    // inner object D.O gets you an outer object.
+    // ('===' does distinguish inner and outer objects.)
+    // (That's a capital '=', if you must know.)
+    ok(g1iDO.unsafeDereference() === g1o, "g1iDO has the right referent");
+
+    // However, Debugger.Objects do distinguish inner and outer windows.
+    const g1oDO = g1iDO.makeDebuggeeValue(g1o);
+    ok(g1iDO !== g1oDO, "makeDebuggeeValue doesn't innerize");
+    ok(g1iDO.unsafeDereference() === g1oDO.unsafeDereference(),
+       "unsafeDereference() outerizes," +
+       " so inner and outer window D.Os both dereference to outer");
+
+    ok(dbg.addDebuggee(g1o) === g1iDO, "addDebuggee returns the inner window's D.O");
+    ok(dbg.hasDebuggee(g1o), "addDebuggee adds the correct global");
+    ok(dbg.hasDebuggee(g1iDO),
+       "hasDebuggee can take a D.O referring to the inner window");
+    ok(dbg.hasDebuggee(g1oDO),
+       "hasDebuggee can take a D.O referring to the outer window");
+
+    const iframe2 = document.createElement("iframe");
+    iframe2.src = "iframe2_makeGlobalObjectReference.html";
+    iframe2.onload = iframe2OnLoad;
+    document.body.appendChild(iframe2);
+
+    function iframe2OnLoad() {
+      // makeGlobalObjectReference dereferences CCWs.
+      const g2o = iframe2.contentWindow;
+      g2o.g1o = g1o;
+
+      const g2iDO = dbg.addDebuggee(g2o);
+      const g2g1oDO = g2iDO.getOwnPropertyDescriptor("g1o").value;
+      ok(g2g1oDO !== g1oDO, "g2's cross-compartment wrapper for g1o gets its own D.O");
+      ok(g2g1oDO.unwrap() === g1oDO,
+         "unwrapping g2's cross-compartment wrapper for g1o gets the right D.O");
+      ok(dbg.makeGlobalObjectReference(g2g1oDO) === g1iDO,
+         "makeGlobalObjectReference unwraps cross-compartment wrappers, and innerizes");
+
+      SimpleTest.finish();
+    }
+  }
+};
+
+</script>
+</pre>
+</body>
+</html>