delete-muut-threads-by-user.js

var username = 'Sagethedestroyer';
var postsToDelete = [];
$('.m-moot.m-expanded').each(function(idx, el) {
  $el = $(el);

  if ($el.find('.m-facelink').attr('title') === username) {
    postsToDelete.push($el);
  }
  
});

var timer = setInterval(function() {
  $el = postsToDelete.pop();
  if ($el == null) {
    return;
    clearInterval(timer);
  }
  $close = $el.find('.m-action.m-remove');
  $close.click();
  $('.m-dialog-foot button').last().click();
}, 100);