Examine source code of Bookmarks On New Tab

{
  "manifest_version": 2,
  "name": "New tab bookmarks",
  "version": "0.14",
  "description": "new tab bookmarks",
  "icons": {
    "48": "icons/black-square48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "new_tab_bookmarks@example.com"
    }
  },
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "src/index.html"
  }
}