Examine source code of Wiki Daily

{
  "manifest_version": 2,
  "name": "Wiki Daily",
  "version": "1.0",
  "description": "Shows Wikipedia's Featured Article of the Day",
  "icons": {
    "48": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "id": "{48470f48-b161-4cf2-bd95-de2998197f9e}"
    }
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.svg",
    "default_popup": "popup.html",
    "default_title": "Wiki Daily"
  }
}