// ==UserScript==
// @name         Reddit Image Direct Link
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Open Reddit images directly
// @author       You
// @match        https://www.reddit.com/*
// @match        https://old.reddit.com/*
// @match        https://preview.redd.it/*
// @match        https://i.redd.it/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';
  var xhrOverride = function(xhr) {
    xhr.setRequestHeader('Accept', 'image/*');
  };
  var openOverride = function(open) {
    return function(url, method, async, user, password) {
      if (url.startsWith('https://preview.redd.it/') || url.startsWith('https://i.redd.it/')) {
        xhrOverride(this);
      }
      return open.apply(this, arguments);
    };
  };
  XMLHttpRequest.prototype.open = openOverride(XMLHttpRequest.prototype.open);
})();