Examine source code of JP-Startpage

{
  "manifest_version": 3,
  "name": "JP-Startpage",
  "version": "1.3.0",
  "description": "Keyboard-driven browser startpage with a Japanese terminal aesthetic.",
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jpstartpage@ritchot.me",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "locationInfo"
        ]
      }
    }
  },
  "optional_permissions": [
    "geolocation"
  ],
  "chrome_settings_overrides": {
    "homepage": "index.html"
  }
}