Mozilla is gearing up for a major user interface overhaul for the open source Firefox web browser. Code-named Australis, the new UI is likely to debut as part of Firefox 25, due out in October of his year.
The Australis overhaul will be the biggest UI change since Firefox 4, which became generally available in March of 2011. After Firefox 4, Mozilla changed its release approach, from having only one or two releases in a year, to a rapid release cycle with new browsers released every six to eight weeks.