Examine source code of Copycat

{
  "manifest_version": 2,
  "name": "Copycat",
  "version": "1.0.0",
  "description": "Gives you the ability to copy any URL beneath your cursor by pressing the Z key on your keyboard, or copy hypertext as plain text by pressing the X key.",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery-3.6.0.min.js",
        "copylinkaddress.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "copy@cat"
    }
  },
  "icons": {
    "48": "/icons/icon48.png",
    "128": "/icons/icon128.png"
  },
  "web_accessible_resources": [
    "sounds/pop.mp3"
  ]
}