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diff --git a/dom/plugins/test/mochitest/file_bug863792.html b/dom/plugins/test/mochitest/file_bug863792.html
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index 000000000..b4d3dc2e0
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+++ b/dom/plugins/test/mochitest/file_bug863792.html
@@ -0,0 +1,45 @@
+<!doctype html>
+<html>
+<head>
+  <title>File for Bug 863792</title>
+
+  <meta http-equiv="content-type" content="text/html; charset=utf-8">
+  <base href="chrome://browser/content/">
+</head>
+<body>
+<script type="application/javascript">
+
+// A plugin that removes itself from the document and inactivates said document
+// inside NPP_New. We should not leak the instance. See also test_bug854082
+
+var outerwindow = window;
+var i = document.createElement("iframe");
+i.width = 500;
+i.height = 500;
+var ob = document.body;
+document.body.appendChild(i);
+i.addEventListener("load", function loaded() {
+  var id = i.contentDocument;
+  var e = id.createElement("embed");
+  var callbackrun = false;
+  e.width = 200;
+  e.height = 200;
+  e.type = "application/x-test";
+  e.__defineSetter__("pluginFoundElement", function() {
+    window.console.log("pluginFoundElement");
+    e.style.display = "none";
+    e.clientTop;
+    i.removeEventListener("load", loaded);
+    ob.removeChild(i);
+    id.body.clientTop;
+    id.body.removeChild(e);
+    callbackrun = true;
+  });
+  id.body.appendChild(e);
+  e.clientTop;
+  e = id = i = ob = null;
+  SpecialPowers.forceCC(); SpecialPowers.forceGC();
+}, false);
+</script>
+</body>
+</html>