Since quite some time Mozilla is talking about releasing their new user interface "Australis". Acutally to company first started to mention the arrival of Australis with version 25 of Firefox but the it got delayed and delayed. But meanwhile, with version 29 it looks like "Australis" is finally being rolled out.
"Australis" should have been available already with Version 25 of Firefox but it finally made it into the browser just four revision steps later. Never the less the new interface is now out and it had been integrated into Aurora version of the browser.
Next to the new user interface there are also "Firefox Accounts" as well as "Firefox Sync" which got added to the software's toolbox. In case of Sync it is now possible to for example synchronize Data from your Google account with Firefox, which means you'll have direct access to that data.
Should you be willing to try the latest version of Firefox, then we recommend the following link further below. But be aware, that Moziall hasn't yet gotten rid of all bugs.
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Firefox 29 AuroraSource:
Le Comptoir du Hardware