Kill sticky headers and re-enable scrolling

kill-sticky.js

// Original gist from https://alisdair.mcdiarmid.org/kill-sticky-headers/ (thank you!)
// My only addition is re-enabling scrolling since some sites disable it while
// their pop-up is active.
// Just copy the below and paste it at http://mrcoles.com/bookmarklet/ to 
// properly escape the string and create a convenient "this link" that can
// be dragged to the bookmark bar.  A more advanced version, also written
// by Mr. Coles, is available on npm: npm -g install bookmarklet
var i, elements = document.querySelectorAll('body *');

for (i = 0; i < elements.length; i++) {
  if (getComputedStyle(elements[i]).position === 'fixed') {
    elements[i].parentNode.removeChild(elements[i]);
  }
}

document.body.style.height = "100%";
document.body.style.overflow = "auto";