You can download the UX nightly for all platforms at http://people.mozilla.org/~jwein/ux-nightly/ http://people.mozilla.org/~jwein/ux-nightly/ I'm using it now

You can download the UX nightly for all platforms at http://people.mozilla.org/~jwein/ux-nightly/ http://people.mozilla.org/~jwein/ux-nightly/ I'm using it now as my primary browser.