jQuery(document).ready(function () {
  function decodeEntity(inputStr) {
    if (!inputStr) return '';
    var textarea = document.createElement('textarea');
    textarea.innerHTML = inputStr;
    return textarea.value;
  }

  function decodeEverything() {
    var html = document.querySelector('html');
    var walker = document.createTreeWalker(html, NodeFilter.SHOW_TEXT);
    var node;
    while ((node = walker.nextNode())) {
      node.nodeValue = decodeEntity(node.nodeValue);
    }
  }

  decodeEverything();

  console.log('decoding...');
});