Examine source code of QRLink

{
  "manifest_version": 2,
  "name": "QRLink",
  "short_name": "QRL",
  "description": "Generate QR code for any page to allow link sharing from browser to other devices.",
  "version": "1.2resigned1",
  "author": "Rafik TIGHILT",
  "browser_action": {
    "default_icon": "icon32.png",
    "default_popup": "popup.html",
    "default_title": "Generate QRCode for this page"
  },
  "permissions": [
    "activeTab",
    "https://ajax.googleapis.com/"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd90e58a-7da6-47e5-baa7-8b7356c6d697}"
    }
  }
}