Examine source code of Smart Marks

{
  "browser_specific_settings": {
    "gecko": {
      "id": "licereo23@example.com"
    }
  },
  "manifest_version": 3,
  "name": "Smart Mark",
  "version": "1.0",
  "description": "Smart Mark Uses the Fire fox API to search through, add, and delete bookmarks from the user's bookmark tree.",
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "bookmarks"
  ]
}