User:Killer9000/common.js

var elms = document.querySelectorAll("*[style]");
Array.prototype.forEach.call(elms, function(elm) {
  // Get the color value
  var clr = elm.style.background || "";
  // Remove all whitespace, make it all lower case
  clr = clr.replace(/\s/g, "").toLowerCase();
  console.log(elm.style.background);
  // Switch on the possible values we know of
  switch (clr)
  {
  case "rgb(238, 238, 238)":
    elm.style.background = "rgb(22, 22, 22)";
    break;
  }
  console.log(elm.style.background);
});