You can install the latest stable version from
https://chrome.google.com/webstore/detail/laeofjkehjlnochcbhjmbjomogkcanmk
To install the development version and hack on this yourself;
git clone [email protected]:rainforestapp/github-chrome.git
cd github-chrome
npm install coffee-script -g
npm install haml-coffee compass mocha should
cake build
cake watch
Then, install the extension
- Open Chrome's extension tab by visiting chrome://extensions
- Check "Developer mode" is ticked
- Click "Load unpacked extension..."
- Select the root of the cloned repository