Examine source code of Codex Stellarium

{
  "manifest_version": 3,
  "name": "Codex Stellarium",
  "version": "1.0",
  "description": "Astronomy inspired custom animated new tab page",
  "author": "Sandesh Bhandari (snes)",
  "browser_specific_settings": {
    "gecko": {
      "id": "codex-stellarium@snes19xx.github.io",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.open-meteo.com/*"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "32": "icon-32.png",
    "64": "icon-64.png",
    "128": "icon-128.png"
  }
}