I think I've figured out how to watch them using the legit software that you would commonly use under Windows more often than not.
HTML 5 is common for You tube under Mint with added 3rd party Software along with You tube Browser extensions.
I'll post about this when I can figure out again how I done it but suffice to say I can watch Flash and Java. I'll have to go back over on my steps as I can't remember off hand.