Examine source code of Bookmarks New Tab Page

{
  "manifest_version": 2,
  "name": "Bookmarks New Tab Page",
  "short_name": "Bookmarks",
  "version": "0.1.1",
  "description": "Simple bookmarks-based new tab page.",
  "permissions": [
    "bookmarks",
    "http://*/*",
    "https://*/*"
  ],
  "chrome_url_overrides": {
    "newtab": "tab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "tab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8b3cdd81-590d-4f78-b84a-5d729196b7f5}"
    }
  }
}