Examine source code of Share QR Code

{
  "manifest_version": 2,
  "name": "Share QR Code",
  "description": "Share url, selection, page and images as qrcode",
  "version": "0.0.1",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a36b35cd-051a-4478-9d10-f972bf26def9}"
    }
  }
}