Examine source code of QR Reader

{
  "manifest_version": 2,
  "name": "Universal QR Code Toolkit",
  "version": "2.0.0",
  "description": "Scan and generate QR codes 100% locally. Support for screen area selection, local drag & drop, right-click images, and real-time generation.",
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "lib/jsQR.js",
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "Universal QR Code Toolkit",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "web_accessible_resources": [
    "lib/jsQR.js",
    "content.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "qr-reader@nathan-qr-reader"
    }
  }
}