Examine source code of New Tab GTD

{
  "name": "New Tab GTD",
  "short_name": "New Tab GTD",
  "description": "Clean, pleasing and minimalist New Tab Extension that makes you more productive by just showing you the essentials",
  "author": "Xavi Esteve",
  "version": "1.8.3",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{58823624-33aa-4f2f-ad15-4de95e90c0af}",
      "data_collection_permissions": {
        "required": [
          "bookmarksInfo"
        ]
      }
    }
  },
  "icons": {
    "48": "icon.svg"
  },
  "permissions": [
    "tabs",
    "sessions",
    "storage",
    "bookmarks"
  ],
  "optional_permissions": [
    "https://ipinfo.io/*",
    "https://ifconfig.co/*",
    "https://api.open-meteo.com/*",
    "https://geocoding-api.open-meteo.com/*"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  }
}