“But this is just one of the new features presented in the 2012
roadmap which are already available in the latest Firefox Nightly.
There’s no new default theme yet, but for instance, the new tab
page is already available for quite some time (with some
improvements to the initial release):“There’s also a new home page (has been available in Nightly for
a while) which lets you quickly access the downloads, bookmarks,
history, addons, sync and settings:“And finally, there’s also a built-in PDF viewer:”