No, I'm afraid that won't work. No new browser in years and years, and even if there were a browser, the J720 doesn't have the CPU power to stream a youtube.
DVD Catalyst
(it may have a different name now
) had a specific J720 setting for showing stored videos, so one could convert a downloaded youtube video to an easier format. But recently, I've seen that Mitch has pulled his conversion software from sale
Jake
P.S. Does anyone know why Mitch decided to do this?