Sorry for my bad english, it is opening it in a new tab, but it looks terrible. It opens a tab that is like 2cm from left to right, otherwise full size on the screen, but still not showing like a fullscreen... I dont know how to explain :(
By launching the client it is kind of weird, almost fullscreen, but while the game is loaded have to either fullscreen it or cant see the bottom bar for inventory etc. Want it to be a pop up or something easier...