Examine source code of Short URL app

{
  "manifest_version": 2,
  "name": "Short URL app",
  "version": "1.8",
  "description": "shrturl.app is a fast, reliable and free service to reduce a long URL. Use our app to shorten a long URL for sharing.",
  "homepage_url": "https://shrturl.app",
  "icons": {
    "48": "icons/logo.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "identity",
    "https://shrturl.app/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d16faad4-1387-47c0-b432-3c528ea6a921}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  },
  "browser_action": {
    "default_icon": "icons/logo.png",
    "default_title": "shrturl",
    "default_popup": "popup.html"
  }
}