Examine source code of Ticketmaster checkout

{
  "description": "Automatically refreshes until the tickets are available to buy and tries to checkout.",
  "manifest_version": 2,
  "name": "Ticketmaster checkout",
  "version": "1.1",
  "icons": {
    "48": "icons/128.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.ticketmaster.ie/*",
        "*://*.ticketmaster.com/*"
      ],
      "js": [
        "checkout.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{26d53cb0-8aec-42b8-83b8-7bc157f35604}"
    }
  }
}