Maybe it's your OS? They look very different to me on Windows. The orange Firefox top menu is gone, the tabs have gained an "x" button, the "+" no longer has a border, the padding above the tabs is reduced, there are 3 new buttons on the search bar which is now larger and lost its colored background, and the forward button is gone.
It looks more like Chrome than it does old Firefox.
It looks more like Chrome than it does old Firefox.
http://i.imgur.com/Y3ZFcD4.png