 It is also used to implement an improved frecency-based algorithm for the new location bar auto-complete feature (dubbed the "Awesomebar").The Mac version of Firefox 3 supports Growl notifications, the Mac OS X spell checker, and Aqua-style form controls.To give the browser a more native look and feel on different operating systems, Firefox 3 uses separate themes for Mac OS X, Linux, Windows XP, and Windows Vista.