This should do it with jQuery...
$('a[target="_blank"]').removeAttr('target');
With a modern browser...
Array.from(document.querySelectorAll('a[target="_blank"]'))
.forEach(link => link.removeAttribute('target'));
With an older browser such as earlier IEs...
var links = document.links, i, length;
for (i = 0, length = links.length; i < length; i++) {
links[i].target == '_blank' && links[i].removeAttribute('target');
}
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