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diff --git a/js/xpconnect/tests/mochitest/test_bug623437.html b/js/xpconnect/tests/mochitest/test_bug623437.html
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+++ b/js/xpconnect/tests/mochitest/test_bug623437.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=623437
+-->
+<head>
+  <title>Test for Bug 623437</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=623437">Mozilla Bug 623437</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 623437 **/
+    var c = document.createElement("canvas").getContext("2d");
+    var seenArcToFirst;
+    var seenArc = false;
+    var seenArcTo = false;
+    for (var i in c) {
+      if (i == "arc") {
+        seenArc = true;
+        if (!seenArcTo)
+          seenArcToFirst = false;
+      }
+      if (i == "arcTo") {
+        seenArcTo = true;
+        if (!seenArc)
+          seenArcToFirst = true;
+      }
+    }
+    is(seenArc, true, "Should see arc");
+    is(seenArcTo, true, "Should see arcTo");
+    is(seenArcToFirst, true, "Should see arcTo before arc");
+</script>
+</pre>
+</body>
+</html>