Examine source code of Chanting Counter

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "Chanting Counter",
  "action": {
    "default_popup": "index.html",
    "default_icon": "favicon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{feea143b-a696-40b1-ab9f-4a2f57c43318}"
    }
  }
}