Examine source code of QR Code Extractor

{
  "manifest_version": 2,
  "name": "QR Code Generator",
  "version": "1.1",
  "description": "Generate and download QR codes from the current webpage.",
  "permissions": [
    "activeTab",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": {
      "16": "qr.png",
      "48": "qr.png",
      "128": "qr.png"
    },
    "default_popup": "index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5a692d0b-8d77-400e-836c-95ab4b9e10af}"
    }
  }
}