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Test Info:

<html>
<head>
<script>
function start () {
const canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas')
SpecialPowers.forceGC();
canvas.toBlob(function (blob) {
blob.stream()
blob.arrayBuffer().then(() => {})
})
}
window.addEventListener('load', start)
</script>
</head>
</html>