Mozilla last week said that the earliest its new "Australis" UI will appear in Firefox is at the end of April, six weeks later than the company previously projected. Australis, the first visual overhaul of Firefox since March 2011, will be promoted to the "Aurora" channel today as the company rolls out Firefox 29 to its pre-beta build line. Mozilla uses a three-stage development process that ships Aurora, Beta and Release versions of each version of Firefox, with six weeks separating Aurora and Beta, another six between Beta and Release.