rps-img-https.js

// ==UserScript==
// @name        RPS mixed-content defuckifier
// @namespace   rps-img-https
// @include     https://www.rockpapershotgun.com/*
// @version     1
// @grant       none
// ==/UserScript==

var images = document.getElementsByTagName('img');
var length = images.length;
var match = new RegExp('^http://(www\.)?rockpapershotgun\.com/');
var proto = new RegExp('^http://');
for (var i = 0; i < length; i++) {
  var img = images[i];
  if (match.test(img.src)) {
    img.src = img.src.replace(proto, "https://");
  }
}