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diff --git a/dom/tests/mochitest/general/test_497898.html b/dom/tests/mochitest/general/test_497898.html
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+++ b/dom/tests/mochitest/general/test_497898.html
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+<html>
+<head>
+<title>Crash [@ nsFocusManager::SendFocusOrBlurEvent] after switching focus to a different window in this case</title>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script>
+SimpleTest.waitForExplicitFinish();
+
+function done()
+{
+ is("passed", "passed", "test passed without crashing");
+ SimpleTest.finish();
+}
+
+function switchFocus()
+{
+ setTimeout(() => window.open('497633.html', '_new', 'width=300,height=300'), 0);
+}
+</script>
+</head>
+<body>
+ <iframe srcdoc="<html><meta charset='utf-8'>
+ <head>
+ <script>
+ function run() {
+ setTimeout(() => document.getElementById('a').focus(), 0);
+ }
+ </script>
+ </head>
+ <body onload='run()'>
+ <button id='a' onfocus='parent.switchFocus()' onblur='window.frameElement.parentNode.removeChild(window.frameElement)'>Switching focus to a different program should not crash Mozilla</button>
+ </body>
+ </html>">
+ </iframe>
+
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+
+</body>
+</html>
+