Kill sticky and fixed headers bookmarklet, and possibly re-enable scrolling of the page

kill-sticky-fixed.js

(function () {
  const elements = document.querySelectorAll('body *');
  const body = document.querySelector('body');
  
  if (getComputedStyle(body).overflow === 'hidden') {
    body.style.overflow = "unset";
  }
  
  elements.forEach(function (element) {
    if (["-webkit-sticky", "sticky", "fixed"].includes(getComputedStyle(element).position)) {
      element.parentNode.removeChild(element);
    }
  });
})();