Examine source code of Kids Safe Tab

{
  "manifest_version": 2,
  "name": "Kids Safe Tab",
  "version": "1.0",
  "description": "Display kid-friendly content on new tab.",
  "permissions": [
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{27982bd4-7498-4498-9497-b0e0bf4ed3e6}"
    }
  }
}