Examine source code of Datawrapper Tool

{
  "manifest_version": 2,
  "name": "Datawrapper Tool",
  "version": "1.0",
  "description": "Quick access to Datawrapper.net from your browser.",
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup.html",
    "default_title": "Open Datawrapper"
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab0c615c-9b12-4e0c-b1a7-7c82f1441ee6}"
    }
  }
}