# Extension Modules

Manage the extensions that run inside your generated apps. Open it from [⋮ → Extension Modules](/guide/main-screen/more).

## What you can manage

Built-in modules, custom JS/CSS modules, userscripts, and MV3 Chrome extensions — all normalized into one internal model.

## Features

- **List & toggle** — enable or disable installed extensions per app.
- **Editor** — create or edit a module: manifest, JS, CSS, config items, and an interactive panel. See [JS Modules](/extensions/js-module).
- **Market** — browse the community module market. See [Publish to the Market](/extensions/publish).
- **Browser extensions** — search the Chrome Web Store live and install MV3 extensions. See [Chrome MV3](/extensions/chrome-mv3).
- **AI developer** — jump to [Agent](/guide/more-features/agent) to generate an extension.

## Related

- [Userscripts](/extensions/userscript) — the `GM_*` / `GM.*` API reference.
- [API Reference](/extensions/api-reference) — functional/stub status per API.