Based on:
https://github.com/mutantzombie/JavaScript-ViewState-Parser
https://github.com/tomhodgins/extstyler
To install extstyler you will need to load up Chrome and navigate to your extensions page located chrome://extensions (link valid in Chrome only).
You can also access this page by using the Chrome menu and selecting: Window > Extensions
On the chrome://extensions page you will find a button labelled 'Load Unpacked Extension…'