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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Custom Tab",
  "description": "New tab with custom clocks and custom themes",
  "version": "0.0.0.1",
  "icons": {
    "128": "icon_128.png"
  },
  "action": {
    "default_title": "Custom Tab",
    "default_icon": "icon.png",
    "default_popup": "index.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  }
}