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diff --git a/dom/base/crashtests/1566310.html b/dom/base/crashtests/1566310.html
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+++ b/dom/base/crashtests/1566310.html
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+<!doctype html>
+<html>
+<head>
+<script type="text/javascript">
+function noop() {}
+function crash() {
+ let div = document.querySelector("div");
+ let ifr = document.querySelector("iframe");
+
+ // We need a reference to the iframe's window from *before* it gets detached.
+ let win = ifr.contentWindow;
+
+ div.appendChild(ifr);
+
+ win.addEventListener("beforeunload", noop);
+ win.removeEventListener("beforeunload", noop);
+}
+</script>
+</head>
+<body onload="crash()">
+ <div></div>
+ <iframe></iframe>
+</body>
+</html>