Examine source code of QR Code Pro

{
  "manifest_version": 2,
  "name": "QR Code Generator",
  "description": "Generate QR codes from URLs with one click!",
  "version": "1.0",
  "main": "index.js",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "128": "icons/logo.png"
    }
  },
  "icons": {
    "128": "icons/logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6b6ccf88-9ef9-46b7-9871-cccd8e153917}"
    }
  }
}