Add-ons for you to turn Firefox into Mac OS X application :)
Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).
Fission combines address bar and progress bar (Safari style). This makes the progress bar more visible and allows for a nice visual effect.
This includes 3 features about the find toolbar. First, the dictionary-assisted find. Second, more customizable Find Toolbar. Third, the highlight feature like Safari 3.