Examine source code of Webpage QR Reader

{
  "manifest_version": 2,
  "name": "Webpage QR Reader",
  "version": "1.0.0",
  "description": "Select an area on any webpage to scan and open QR codes. All processing happens locally in your browser — no data is collected, stored, or sent to any server. Only the decoded URL is used to open a new tab.",
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reptilex.qrreader@gmail.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.svg",
    "default_title": "Webpage QR Reader"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jsQR.js",
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ]
}