Examine source code of Auto Cookie Cleaner

{
  "manifest_version": 2,
  "name": "Auto Cookie Cleaner",
  "version": "1.0",
  "description": "Automatically delete cookies after leaving a site.",
  "permissions": [
    "cookies",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d800e217-9062-4299-bea0-736d0db2c1fb}"
    }
  }
}