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<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<window title="Window Open Test"
height="300"
width="300"
sizemode="normal"
customtitlebar="true"
id="window"
persist="height width sizemode">
<script type="application/javascript"><![CDATA[
window.addEventListener("sizemodechange", () => {
window.arguments[0].postMessage("sizemodechange", "*");
});
]]></script>
</window>