I checked the developer build and I don’t understand why they need to be over the address bar like Chrome. It’s not efficient or anything. Current Safari style design is perfect, it just needs a dark theme. I like the huge constant space on each side of the address bar where I can control its window easily without trying to get into the tiny space between the top of the tab and top border of the window.
Chrome’s design looked good to people at first because it was something different but it’s no longer different and function-wise it’s just not better at all.