background.js

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Simple extension to replace lolcat images from
// http://icanhascheezburger.com/ with loldog images instead.

chrome.browserAction.onClicked.addListener(() => {
  let url = "https://icanhas.cheezburger.com/";
  chrome.tabs.create({ url });
});

chrome.webRequest.onBeforeRequest.addListener(
  (info) => {
    console.log("Cat intercepted: " + info.url);
    // Redirect the lolcal request to a random loldog URL.
    var i = Math.round(Math.random() * loldogs.length);
    return { redirectUrl: loldogs[i] };
  },
  // filters
  {
    urls: [
      "https://i.chzbgr.com/*"
    ],
    types: ["image"]
  },
  // extraInfoSpec
  ["blocking"]
);