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diff --git a/dom/plugins/test/mochitest/test_instantiation.html b/dom/plugins/test/mochitest/test_instantiation.html
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index 000000000..e8fc07745
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+++ b/dom/plugins/test/mochitest/test_instantiation.html
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+<head>
+  <title>Plugin instantiation</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="plugin-utils.js"></script>
+
+<body onload="mainLoaded()">
+  <iframe id="iframe1" src="about:blank" width="600" height="600"></iframe>
+
+  <script class="testbody" type="application/javascript">
+  SimpleTest.waitForExplicitFinish();
+  setTestPluginEnabledState(SpecialPowers.Ci.nsIPluginTag.STATE_ENABLED);
+
+  var iframe = document.getElementById('iframe1');
+
+  function mainLoaded() {
+    var p = iframe.contentDocument.createElement('embed');
+    p.setAttribute('id', 'plugin1');
+    p.setAttribute('type', 'application/x-test');
+    p.setAttribute('width', '400');
+    p.setAttribute('height', '400');
+    p.setAttribute('drawmode', 'solid');
+    p.setAttribute('color', 'FF00FFFF');
+    iframe.contentDocument.body.appendChild(p);
+
+    // Plugin instantiation happens asynchronously
+    SimpleTest.executeSoon(function() {
+      SimpleTest.executeSoon(function() {
+        ok(p.setColor !== undefined, "Dynamic plugin instantiation.");
+        SimpleTest.finish();
+      })
+    });
+  }
+  </script>