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diff --git a/dom/performance/tests/test_performance_timing_json.html b/dom/performance/tests/test_performance_timing_json.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1375829
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 1375829</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <script type="application/javascript">
+
+ /** Test for Bug 1375829 **/
+ var json = performance.timing.toJSON();
+
+ // Ensure it doesn't have any attributes that performance.timing doesn't have
+ for (let key of Object.keys(json)) {
+ ok(key in performance.timing, key + " should be a property of performance.timing");
+ }
+
+ </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1375829">Mozilla Bug 1375829</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>