Examine source code of QR Tab

{
  "manifest_version": 2,
  "name": "QR Tab",
  "version": "1.1resigned1",
  "description": "Generates a QR Code to send the link of your current tab to another device.",
  "icons": {
    "48": "icons/qrt.svg",
    "96": "icons/qrt.svg"
  },
  "browser_action": {
    "default_icon": "icons/qrt.svg",
    "default_title": "QR Tab",
    "default_popup": "popup/qrtab.html"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "options_ui": {
    "page": "settings/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{854432ed-978c-484d-970c-3e6f2eb23da7}"
    }
  }
}