Examine source code of Unshortit.com

{
  "name": "Unshortit.com",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "images/icon38.png",
      "32": "images/icon38.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.0.5.0",
  "description": "Browse shortlinks without visiting them directly",
  "icons": {
    "16": "images/favicon.ico",
    "48": "images/favicon.ico",
    "128": "images/favicon.ico"
  },
  "permissions": [
    "contextMenus",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "./js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "./js/content-script.js",
        "./js/jquery-3.6.0.min.js",
        "./js/bootstrap.min.js"
      ],
      "css": []
    }
  ]
}