Clone repo, navigate into it, run below commands:
yarn install
yarn start
Then open browser at http://localhost:3000/ to enjoy.
Execute script to create a production build:
yarn build
A new folder build/ will be appear at project root directory. Go to chrome://extensions/, turn on Developer mode and load it:
Now we can test extension directly at local machine.
Documentation for Chrome extensions developers:
https://developer.chrome.com/docs/extensions/
Official samples for Chrome Extensions:
https://github.com/GoogleChrome/chrome-extensions-samples