I believe it's a good extension for Google Chrome, but.....
I enjoyed the full concert DVD from the Talking Heads and after that, I shutted Chrome and Ubuntu down.
The next morning I wanted to work with Ubuntu again and found out that the Cinnamon desktop crashed.
It is still not working, but that's my problem.
Personally I think that Videostream is the reason for this crash.
I'am not an Ubuntu nor a Cinnamon expert, but I will try to find oud why it crashed.