Build your browser product, not the boilerplate.
MkExt is a production-ready WXT and React starter with every browser surface, Better Auth integration, typed messaging, shared storage, localization, themes, and cross-browser delivery already configured.
- Open source
- Chrome and Firefox
- Production-ready foundation
MkExtSide panel
MkExt
Extension popup
Built with the tools modern extension teams already trust
Batteries included
Everything around your core idea is already built.
A practical foundation for browser products: UI, authentication, state, messaging, localization, cross-browser builds, and delivery all follow one coherent structure.
Every extension surface included
Popup, options, side panel, new tab, DevTools, content script, background worker, and auth tabs are ready to customize.
Chrome and Firefox
Build Chrome Manifest V3 and Firefox packages from the same WXT codebase.
Backend-flexible authentication
Connect email or Google OAuth to any compatible Better Auth backend, not just one website template.
Typed messaging and storage
Share browser state through WXT storage and communicate between extension contexts with typed messages.
Localization and themes
English and Chinese dictionaries, browser-language detection, runtime switching, and light, dark, or system themes.
A release path you can trust
TypeScript checks, Biome, GitHub Actions, zipped builds, and optional store submission are already wired together.
Bring your own backend
Connect to any Better Auth backend.
MkExt is not locked to one SaaS template. Point it at MkFast, MkSaaS, TanStack Start, Next.js, or another compatible backend that exposes Better Auth sessions and APIs.
- Bearer sessions persist safely through WXT storage.
- Email and Google OAuth flows are ready for the browser identity callback.
- Keep your existing backend, database, billing, and business logic.
Your web application
Better Auth + API
MkExt
Authenticated extension
One codebase, every surface
Meet users exactly where the work happens.
Choose the browser surface that fits each job. MkExt keeps entrypoints thin and gives them one shared component, auth, storage, and messaging foundation.
Popup
Deliver fast actions in a compact toolbar experience.
Side Panel
Keep your product available beside the page without breaking flow.
Options
Give users a spacious home for preferences and configuration.
New Tab
Turn every new tab into a focused, full-page product surface.
DevTools
Add custom tools and panels directly inside browser DevTools.
Content Script
Enhance web pages with isolated React-powered experiences.
Background
Run event-driven browser logic and coordinate extension contexts.
Extension Tabs
Ship login, onboarding, or other extension-owned full pages.
Quick start
From clone to a running extension in minutes.
The project structure and scripts stay predictable from the first local run through the final browser-store package.
Make it yours
Start from the repository, install with Bun, and keep only the extension entrypoints your product needs.
Connect and customize
Set your backend URL, customize the shared UI, and run Chrome or Firefox with fast WXT reloads.
Build and ship
Generate Chrome and Firefox zip files locally or publish through the included GitHub Actions workflow.
$ bun install
$ cp .env.example .env
$ bun run dev:chrome
✓ Extension ready at build/chrome-mv3
Open source
Your browser companion starts here.
Start with the extension architecture already in place, then spend your time building the feature only your product can deliver.
Follow MkFastHQ on GitHub