To run the extension locally,

1. Check if your Node.js version is >= 6.
2. Clone the repository.
3. Install yarn.
4. Run yarn.
5. Run npm run start
6. Load your extension on Chrome following:
   1. Access chrome://extensions/
   2. Check Developer mode
   3. Click on Load unpacked extension
   4. Select the build folder.

This workflow uses the webpack server with auto reload feature that reloads the browser automatically every time that you save some file o your editor.

You can run the dev mode on other port if you want. Just specify the env var port like this:

$ PORT=6002 npm run start

After the development of your extension run the command

$ NODE_ENV=production npm run build

Now, the content of build folder will be the extension ready to be submitted to the Chrome Web Store.

• Samuel Simões for Chrome Extension Webpack Boilerplate