# ExtensionStart > ExtensionStart is a browser extension starter kit: WXT + React 19 + Tailwind 4 extension app, Firebase auth, Stripe billing via a Cloud Functions backend, a gate (paywall) engine, and store-publishing runbooks. These docs cover setup, the module system, and publishing to Chrome, Firefox, and Edge stores. The kit ships as a monorepo the buyer clones; the `create-extensionstart` wizard prunes optional modules in place. Client state is UX only — entitlements are written server-side by Stripe webhooks. ## Documentation Sets - [Abridged documentation](https://docs.extensionstart.com/llms-small.txt): a compact version of the documentation for ExtensionStart, with non-essential content removed - [Complete documentation](https://docs.extensionstart.com/llms-full.txt): the full documentation for ExtensionStart ## Notes - The complete documentation includes all content from the official documentation - The content is automatically generated from the same source as the official documentation ## Optional - [ExtensionStart website](https://extensionstart.com): Product site and purchase page