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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Customize Newtab",
  "version": "1.0",
  "description": "Customize your browser's new tab",
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "geolocation"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  }
}