If you are a fan of Firefox(or Mozilla in general) then you can for instance download Firefox 28 beta for your Windows 8 or 8.1 machine and/or Aurora as well.
There are subtle differences but it is those differences that are expected and yet still not fully realized.
It is worthy of note that the Windows 8 touch version of Firefox beta (like many betas) does include some notes about existing bugs as you use it. Mozilla reports that on Mathe Windows 8 touch version should be ready for release and Aurora should be in "beta" but it's not clear if all of the anticipated functionality will be available at that time.
There are distinct differences between these 2 versions of the New Firefox and yet both are essentially going through initial testing by beta testers so the differences in the end and the notable changes won't be know until the next release. That's not all - Mozilla has been very busy also releasing Aurora (firefox-29.0a2) -which is a "pre-beta"- on the same day.
Mozilla has been working on a touch - friendly version of Firefox for essentially 2 years, and they have just released the beta version of Firefox 28 (.0b1) which purportedly includes changes to the UI which make it more appropriate for touchscreens. Firefox for Windows 8 Touch and Aurora Beta