Examine source code of Copy Bookmark Folder Id

{
  "author": "igorlogius",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "description": "Copy bookmark folder ids",
  "icons": {},
  "manifest_version": 2,
  "name": "Get Bookmark Folder Id",
  "permissions": [
    "menus",
    "bookmarks",
    "clipboardWrite"
  ],
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{de178f02-f406-4486-9856-f66cb57296ec}"
    }
  }
}