Examine source code of Course Coupon

{
  "name": "Course Coupon",
  "description": "List of 100% free coupons of Udemy and others courses.",
  "version": "0.1.3",
  "manifest_version": 2,
  "icons": {
    "128": "/images/logo-128x128.png"
  },
  "browser_action": {
    "default_popup": "index.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd2b36bd-bf9c-40c5-89f5-edd464f972e1}"
    }
  }
}