Examine source code of Bookmark Age Tracker

{
  "manifest_version": 2,
  "name": "Bookmark Age Tracker",
  "version": "1.0",
  "description": "Tracks the age of bookmarks and alerts users when they are old or no longer accessible.",
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{560f997b-7544-4e10-9ef9-f8b93daee513}"
    }
  }
}