Examine source code of Coupon Vault

{
  "manifest_version": 2,
  "name": "Coupon Vault",
  "version": "1.0",
  "description": "Securely store your discount codes and get notified before they expire.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "storage",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{68b62f7a-ba59-4840-bbb9-86d214b588fb}"
    }
  }
}