Examine source code of Tab Folder Saver

{
  "manifest_version": 3,
  "name": "Tab Folder Saver",
  "version": "1.0.0",
  "description": "Save selected tabs from the current Firefox window into a named bookmark folder and reopen saved sets.",
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-folder-saver@example.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "bookmarks",
    "storage",
    "tabs"
  ],
  "action": {
    "default_title": "Tab Folder Saver",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icon.svg",
      "32": "assets/icon.svg",
      "48": "assets/icon.svg",
      "96": "assets/icon.svg"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "assets/icon.svg",
    "32": "assets/icon.svg",
    "48": "assets/icon.svg",
    "96": "assets/icon.svg"
  }
}