Examine source code of A Focus Dashboard

{
  "short_name": "Afterglow",
  "manifest_version": 2,
  "version": "1.0.3",
  "name": "AfterGlow - A Focus Dashboard",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{54ef7404-8fe3-4c96-be88-6ce1db8c2e30}"
    }
  }
}