View > Toolbars to enable Tabs on Top on the Mac. Unfortunately, the current implementation looks terrible, as they're the same "underside" tabs as before, only now they're between the window controls and the toolbar. (They note that you should wait in Known Issues, so this should get better.)

They also need to adopt something like Safari's URL-field-as-progress-indicator, or at least an animating graphic to indicate loading. Simply switching the refresh button to an 'X' is way too subtle, and at first I didn't think it was actually loading anything.

Edit: Oh, that's weird. I fired it up again and saw the stopwatch graphic and other loading indicators. Now I'm wondering if these didn't work the first time around, or if I just wasn't paying attention to them given that I'm habituated to Safari's indicators.