Examine source code of Car Price

{
  "manifest_version": 2,
  "name": "Car Price",
  "version": "1.2resigned1",
  "description": "Compare the price of any second hand car on the web against our calculated average market price",
  "permissions": [
    "<all_urls>"
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "avp.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{af661e3b-397a-43f1-8329-03100182def8}"
    }
  }
}