Examine source code of Save All to Folder

{
  "manifest_version": 2,
  "name": "Save All to Folder",
  "version": "1.0.0",
  "description": "Save all open tabs from the current window into a new bookmarks folder.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24bf56d4-c5f1-4baf-81de-257ad617223e}",
      "strict_min_version": "116.0"
    }
  },
  "permissions": [
    "tabs",
    "bookmarks",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Save All to Folder",
    "default_popup": "popup.html",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  }
}