TUTORIAL WEBSITE>>>>>>>>http://www.androidpolice.com/2016/04/30/youtube-is-testing-a-new-material-ui-on-the-web/<<<<<<<<<<<<

1) GO TO: www.youtube.com/?gl=US
2) open the developer tools (ctrl + shift + i)
3) go to the `Resources´ tab and delete the VISITOR_INFO1_LIVE cookie for the youtube domain
4) go to the console and define the VISITOR_INFO1_LIVE cookie using the following command:

document.cookie="VISITOR_INFO1_LIVE=Qa1hUZu3gtk;path=/;domain=.youtube.com";
5) reload the page