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diff --git a/dom/base/test/test_window_proto.html b/dom/base/test/test_window_proto.html
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+++ b/dom/base/test/test_window_proto.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for ...</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+ assert_throws(new TypeError, function() {
+ Object.setPrototypeOf(window, Object.create(window));
+ }, "Setting prototype via setPrototypeOf");
+
+ assert_throws(new TypeError, function() {
+ window.__proto__ = Object.create(window);
+ }, "Setting prototype via __proto__");
+}, "Setting the prototype of a window to something that has the window on its proto chain should throw");
+</script>