Examine source code of Beautiful Moon

{
  "description": "Using this theme is like entering a fantasy realm where a mysterious worldly being may live at the end of the moon...",
  "manifest_version": 2,
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "name": "Beautiful Moon",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{09ae3614-55b4-402c-a0da-241d41c05406}"
    }
  }
}