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Test Info:

<!doctype html>
<script>
function start () {
const frame = document.createElement('frame')
document.documentElement.appendChild(frame)
const o1 = document.createElement('c')
o1.insertBefore(frame, o1.childNodes[0])
SpecialPowers.gc();
const xhr = new XMLHttpRequest()
xhr.open('P', '', false)
xhr.send()
}
document.addEventListener('DOMContentLoaded', start)
</script>