Examine source code of Smart Amazon Ratings

{
  "manifest_version": 2,
  "name": "Smart Amazon Ratings",
  "version": "1.0",
  "description": "Adds a smart amazon rating to search results",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.co.uk/s?*",
        "*://*.amazon.com/s?*"
      ],
      "js": [
        "smart-amz.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ]
}