Examine source code of New Tab Override

{
  "manifest_version": 2,
  "name": "New Tab Override",
  "version": "1.0.0",
  "description": "Overrides the default Firefox new tab with a custom page.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "newtaboverride-9c9tz5@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}