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diff --git a/dom/tests/mochitest/bugs/test_bug333983.html b/dom/tests/mochitest/bugs/test_bug333983.html
new file mode 100644
index 000000000..d5ea7abee
--- /dev/null
+++ b/dom/tests/mochitest/bugs/test_bug333983.html
@@ -0,0 +1,35 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=333983
+-->
+<head>
+  <title>Test for Bug 333983</title>
+  <script type="text/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=333983">Mozilla Bug 333983</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 333983 **/
+HTMLElement.prototype.foopy = function () { return "foopy"; }
+
+var foopy = "";
+try {
+  foopy = document.body.foopy()
+} catch (ex) {
+  foopy = ex + "";
+}
+
+is(foopy, "foopy", "HTMLElement.prototype functions work");
+</script>
+</pre>
+</body>
+</html>
+