Examine source code of Racism Simulator

{
  "name": "Racism Simulator",
  "version": "1.4resigned1",
  "manifest_version": 2,
  "description": "Converts 'white' to 'black' for maximum outrage.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*.huffingtonpost.com/*",
        "https://*.huffingtonpost.com/*",
        "http://*.huffingtonpost.co.uk/*",
        "https://*.huffingtonpost.co.uk/*",
        "http://*.huffingtonpost.com.au/*",
        "https://*.huffingtonpost.com.au/*",
        "http://*.huffingtonpost.ca/*",
        "https://*.huffingtonpost.ca/*",
        "http://*.huffingtonpost.co.za/*",
        "https://*.huffingtonpost.co.za/*",
        "http://*.salon.com/*",
        "https://*.salon.com/*",
        "http://*.buzzfeed.com/*",
        "https://*.buzzfeed.com/*",
        "http://*.jezebel.com/*",
        "https://*.jezebel.com/*",
        "http://*.gawker.com/*",
        "https://*.gawker.com/*",
        "http://*.vice.com/*",
        "https://*.vice.com/*",
        "http://*.slate.com/*",
        "https://*.slate.com/*",
        "http://*.thinkprogress.org/*",
        "https://*.thinkprogress.org/*",
        "http://*.motherjones.com/*",
        "https://*.motherjones.com/*",
        "http://*.everydayfeminism.com/*",
        "https://*.everydayfeminism.com/*",
        "http://*.fusion.net/*",
        "https://*.fusion.net/*",
        "http://*.upworthy.com/*",
        "https://*.upworthy.com/*",
        "http://*.vox.com/*",
        "https://*.vox.com/*",
        "http://*.uproxx.com/*",
        "https://*.uproxx.com/*"
      ],
      "js": [
        "util.js",
        "main.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{24966bf9-1f0a-48b0-8745-7a02dc5ff345}"
    }
  }
}