Examine source code of Auto-Bookmark Cleaner

{
  "manifest_version": 2,
  "name": "Auto-Bookmark Cleaner",
  "version": "1.0",
  "description": "Automatically delete bookmarks older than a specified number of days.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{553a682c-3880-4fda-98da-e130260cb78a}"
    }
  }
}