Examine source code of QR Code Grabber

{
  "manifest_version": 2,
  "name": "QR Code Generator",
  "version": "1.0",
  "description": "Generate QR codes for the current page with download option",
  "icons": {
    "48": "icons/icon.svg"
  },
  "permissions": [
    "activeTab",
    "downloads",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "QR Code Generator",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c6a005c8-5a79-46fe-b52b-39a18cceee2d}"
    }
  }
}