Examine source code of URL Shortener

{
  "icons": {
    "16": "icon.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "name": "URL Shortener",
  "short_name": "Shorten URL using tinyurl, bit.ly, cutt.ly, is.gd, v.gd, tny.im and also generate QR code for shortened URL",
  "version": "13.0.2",
  "manifest_version": 2,
  "description": "Shorten the page/selected URL using tinyurl, bit.ly, cutt.ly, is.gd, v.gd, tny.im and also generate QR Code for shortened URL)",
  "browser_action": {
    "default_icon": "icon128.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "https://tinyurl.com/*",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{61ca75f9-d75a-4c04-9246-03f0e75a7786}"
    }
  }
}