Examine source code of Cookie Monster

{
  "manifest_version": 2,
  "name": "Cookie Monster",
  "version": "1.1.2",
  "description": "Cookie Monster lets you easily clear cookies or local/session storage for the currently open website via a couple of clicks.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "*://*/*",
    "cookies",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c9f93b3-553c-402a-a666-2964aa299fbe}"
    }
  }
}