I am glad I saw this thread. When I first started playing live chess on chess.com, closing browser resulted in immediate resign. Now I am back, three years later, and I didn't realised that some things changed in the meantime. In one or two my live games I had some emergencies and had to leave, so I just closed my browser. I am really sorry for that, it is rude. One click on 'Resign' button before closing the browser really doesn't take much time on my side, but saves a lot on the other.
Cheers. And don't do that. 
Congratulations. "U mad bro" just destroyed the last bit of credibility you had.
Your my hero DrExtreme.