Examine source code of Bookmark Folder Exporter

{
  "manifest_version": 2,
  "name": "Bookmark Exporter",
  "version": "1.0",
  "description": "export bookmarks as plaintext URLs",
  "permissions": [
    "bookmarks"
  ],
  "icons": {
    "48": "icons/bookmarkExporterIcon.png"
  },
  "browser_action": {
    "default_title": "Bookmark Exporter",
    "default_popup": "popup/bookmarkExporter.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4fea73c7-55b9-4d21-857c-f3612cda9d89}"
    }
  }
}