Examine source code of Cashback Today Notifier

{
  "name": "Cashback Today",
  "version": "1.0.3resigned1",
  "description": "Never forget to claim cashback again! Use this extension to be reminded when you are shopping on a cashback enabled website.",
  "permissions": [
    "storage",
    "declarativeContent",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "cashback-off.png",
    "default_popup": "cashback.html"
  },
  "icons": {
    "128": "images/icon128.png"
  },
  "manifest_version": 2,
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "js": [
        "contentscript.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    },
    {
      "js": [
        "google.js"
      ],
      "matches": [
        "https://*.google.com/search*",
        "https://*.google.co.uk/search*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a54b9b14-4075-486e-b01d-ed4516606134}"
    }
  }
}