Examine source code of Cookie Clicker

{
  "manifest_version": 2,
  "name": "Cookie Clicker",
  "version": "1.3",
  "description": "Parses page for cookie button and tries to click on minimal permission, or accept.",
  "permissions": [
    "webNavigation",
    "storage"
  ],
  "browser_action": {
    "default_title": "Click Cookie"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "settings.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4a4eaaa-90d9-4b5a-8613-3116dc08f8cb}"
    }
  }
}