Examine source code of iRacing Setup Spotter

{
  "manifest_version": 2,
  "name": "iRacing Setup Spotter",
  "description": "This extension finds all posted setups in the current thread and lists them for download",
  "version": "1.4",
  "page_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "*://members.iracing.com/jforum/posts/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.members.iracing.com/jforum/posts/*"
      ],
      "js": [
        "jquery-3.1.0.min.js",
        "setupspotter.js"
      ],
      "css": [
        "setupspotter.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "loader-svg.svg",
    "download.png"
  ]
}