Examine source code of Letter Generator

{
  "manifest_version": 3,
  "name": "Letter Generator",
  "version": "1.0",
  "description": "Generate professional letters of any type quickly and easily with proper formatting.",
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@lettergenerator.co",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://lettergenerator.co/"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}