Do you want the brand new YouTube Design? - Here we go!
If you want the new YouTube layout before
it's rolled out officially you just have to follow this 4 simple steps:
1. Go to http://www.youtube.com
2. Press Ctrl + Shift and J in Chrome to open the Developer Tools
Press Ctrl+Shift+K in Firefox
3. Click on the "Console" Tab and enter
4. Reload the website and enjoy the new layout.