Mozilla has released a beta for the modern Windows 8 interface, especially designed for touch control. Anyone can download and try the new browser, but expect to find some bugs that need ironing out.
Firefox for Windows 8 Touch browser was announced in early 2012, and was supposed to be released in December 2013, but suffered a few delays.
Firefox for Windows 8 has touch and swipe controls, and you can snap it to other apps or view in full screen mode.
The final version is expected on March 18th, although there have been lots of delays so far for the beta, so it could be later. Firefox is the last of the big three browsers to get a version for the modern Windows 8 user interface.
