Quite an unusual post for an online game, but I didn’t knew that Anno online works for the Mac. Normally more advanced online games need Windows software installed before it works properly, but Anno Online is fully browser based (or at least Mac supported).
I tested the game a bit and it works just fine as it should be. I advise to use safari because of the “full screen” option which hides most other stuff except for the address-bar, which makes the game experience a bit better. I notify also a little bit better performance in Safari as well in comparation with Firefox. Playing the game is very simple. Just go to the Anno online website and login with your uplay account (I at least did) or other account options. Then login, and play! Thats it. For some visuals of the game, check out the trailer below. Enjoy!