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This project is under active development. Does not work on Windows yet.

extension-create workflow npm wip


Create modern cross-browser extensions with no build configuration.

extension-create helps you develop cross-browser extensions with built-in support for module imports/exports, auto-reload, and more. Interested to know how it's being developed? Every week I send emails about its progress. For goals, see the wiki.

Creating an Extension

npx extension-create my-extension-hello
cd my-extension-hello
npm start

A new browser instance (for now, Chrome) will open up with your extension ready for development.

You are done. Time to hack on your extension!

npm start

Getting Started Immediately

Kickstart any sample from Chrome Extension Samples

The chrome-extensions-sample project is a great way to kickstart developing your extension.

If we go to the samples repository and look for an extension sample to work, let's say the make_page_red sample, all we need is to copy and paste it's URL as an argument for the start command:

Optimized for git version 2.30.0. Older versions are supported, but download can take much longer.

npx extension-create start

npm start

Will not only download the extension but also kickstart a Chrome instance in a fresh profile with your sample extension loaded and default auto-reload support. Try it yourself!

Use Microsoft Edge to kickstart any sample from chrome-extesions-sample

You read it! Just run the command above with the --browser=edge flag:

npx extension-create start --browser=edge

And see a Crome Extension sample running automatically. On Edge!

I have an extension

extension-create was designed to have each command/major feature working as a standalone module. This is useful if you have your extension setup but want to benefit from specific features, such as the browser launcher w/ default auto-reload support. You have two ways of doing it.

Integrate extension-create via command line or npm scripts

The first option is to just use the command line interface extension-create provides and add it to your npm scripts. Assuming you want your extension to run the start command (path argument can be omitted if the manifest file is on your extension root folder), here's how it should look in your package.json:

  // ...npm stuff,
  "scripts": {
    "start": "npx extension-create start"

Will load your extension the same way the screenshot above demonstrates. This method is, in fact, what the standard template does when you run the create command npx extension-create <extension-name>.

Using a specific browser for development

Chrome browser logo Microsoft Edge browser logo
Google Chrome ✅ Microsoft Edge ✅

If you want to target a specific browser, just pass the --browser flag to the start command (Chrome or Edge, soon others), like npx extension-create start --browser=edge.

That's it!

Hint: pass all instead of edge as an argument to load both Edge and Chrome at the same time!

What's next?

See the Wiki for stable updates and future project roadmap. If you're interested in the latest news, I write weekly about this project development at


MIT (c) Cezar Augusto.