Examine source code of URL Shortener

{
  "manifest_version": 3,
  "name": "URL Shortener",
  "version": "2.1.4",
  "description": "Shorten, share, and generate QR codes for your URLs.",
  "icons": {
    "16": "icons/favicon-16x16.png",
    "48": "icons/favicon-48x48.png",
    "128": "icons/android-chrome-128x128.png"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "tabs"
  ],
  "host_permissions": [
    "https://urldn.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/favicon-16x16.png",
      "48": "icons/favicon-48x48.png",
      "128": "icons/android-chrome-128x128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4c663351-fbfd-4fc2-9c0c-1066e2da8fc0}"
    }
  }
}