fb-flo

fb-flo is a Chrome extension that lets you modify running apps without reloading. It's easy to integrate with your build system, dev environment, and can be used with your favorite editor.

* Live edit JavaScript, CSS, Images and basically any static resource.
* Works with your editor of your choice.
* Easily integrates with your build step, no matter how complex.
* Easily integrates with your dev environment.
* Configurable and hackable.

Visit the Github project page for documentation https://github.com/facebook/fb-flo#usage