An anonymous reader writes "Following the release of Firefox 28 just two days ago, Mozilla today updated its Firefox Beta channel to version 29 for Windows, Mac, Linux, and Android. This is a massive release: Firefox Sync has been revamped and is now powered by Firefox Accounts, there's a new customization mode, and the major user interface overhaul Australis has finally arrived. Release notes are here: Desktop and Android." Of interest to developers: Firefox 29 will feature the first implementation of CSS3 variables. Yes, variables for CSS (15 years later).