Examine source code of Handy Bookmarks Manager

{
  "manifest_version": 2,
  "name": "Handy Bookmarks Manager",
  "version": "1.0.0",
  "description": "Bookmarks Manager with additional features",
  "developer": {
    "name": "Thusara Senanayake",
    "url": "https://thusarasenanayake.github.io"
  },
  "homepage_url": "https://github.com/Handy-Bookmarks-Manager/hbm-ff",
  "icons": {
    "48": "icons/logo48x48.png",
    "96": "icons/logo96x96.png"
  },
  "permissions": [
    "tabs",
    "bookmarks",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/logo48x48.png",
    "default_title": "Handy Bookmarks Manager"
  },
  "background": {
    "scripts": [
      "background-script.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f3267d3-241c-48c6-a4b6-5b8560106186}"
    }
  }
}