Examine source code of Bookmark Note

{
  "manifest_version": 3,
  "name": "Bookmark Note",
  "version": "1.0",
  "description": "Create quick notes directly on your bookmarks toolbar.",
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b582136e-2144-486d-97d8-392911365319}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Create Bookmark Note",
    "default_icon": "icon-48.png"
  },
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+R",
        "mac": "Alt+R"
      },
      "description": "Open Bookmark Note"
    }
  }
}