Examine source code of Simpl - A minimal new tab extension

{
  "manifest_version": 2,
  "name": "Simpl",
  "version": "1.0.4",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "54.0a1"
    }
  }
}