Examine source code of New Tab

{
  "manifest_version": 2,
  "name": "New Tab",
  "description": "A custom new tab page.",
  "version": "1.0a",
  "developer": {
    "name": "Navinn Ravindaran",
    "url": "https://github.com/navn-r/newtab"
  },
  "permissions": [
    "webNavigation",
    "browserSettings"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8f568f0-d19c-4615-a584-6ac08fb41018}",
      "strict_min_version": "42.0"
    }
  }
}