On safari and opera, instead of moving the tab bar down to reveal the title bar, the close, minimize and maximize buttons slide in from the left next to the tabs. This is similar to the design of firefox when not in fullscreen. The animation that shifts the tab bar down is horrid to look at and disr...
This is one of the small UX items that I feel would improve FF on MacOS. The shift when moving the cursor to the menu bar sometimes makes me miss click on a tab.