<?xml version="1.0" encoding="UTF-8"?> | |
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?> | |
<window id="foo" orient="vertical" | |
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> | |
<script type="application/javascript"><![CDATA[ | |
onload = function onload(event) { | |
let iframe = document.getElementById("foo-iframe"); | |
iframe.addEventListener("DOMContentLoaded", function (event) { | |
alert("You'll never see me - but no one knows why..."); | |
if (this != event.originalTarget) | |
return; | |
// doStuffWith(this.contentWindow); | |
}, true); | |
iframe.setAttribute("src", "http://www.google.com/"); | |
} | |
]]></script> | |
<iframe id="foo-iframe" type="content"/> | |
</window> |
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This is all I see:

(No alert pop-up.)