hello, it should be possible to get to the tabs and address bar with touch gestures like in other metro apps: Swipe in from the top or bottom edge of the screen. - alternatively press windows-key+z or right-click somewhere in a page...
http://windows.microsoft.com/en-us/windows-8/getting-around-tutorial

you can set the preferred search engine through the charms bar (by swiping in from the right or pressing windows-key+c) > settings > search...

Thanks "philipp" for your answer. I was not familiar with "windows-key+c > settings > search" option. But later on I found Windows app engine was maintaining all shorts of preferences of this app. Unfortunately with a few guess I found windows-key+z will solve this problem. But you may be correct, without the touch gesture we can blame Aurora about that. It's really amazing if you know the keyboard key of the mozilla. :)

Where did you see Aurora as a Windows 8 application?

Aurora is not the name of a version but one of the four main development channels. They are Release (26.0), Beta (27.0b9 currently), Aurora (28.0a2) and Nightly (29.0a1). When Firefox 27.0 is released on Feb 4 the versions will move/merge to next channel around time also.

Aurora is not meant for regular use as Aurora and Nightly gets checkins almost everyday and they get a update each of those days.

Also there is a good chance that the Australis that many people dislike will move with 29.0 from Nightly to the Aurora channel next week.

Edit: Hmm you may have seen older articles like https://blog.mozilla.org/futurereleases/2013/09/21/help-test-a-preview-of-firefox-optimized-for-windows-8-tablets/

At the time of that article, version Firefox 26.0 was being developed early on the Aurora channel.

Hi James, Aurora now has a "Relaunch" item on the menu to switch from regular desktop Firefox to the Metro style application. This new support article has the details: How do I launch Firefox for Windows 8 Touch?