A while back, the Firefox 2012 roadmap was announced and it included quite a few important changes, some of which are already available in the latest Firefox Nightly.

A few days ago, a Firefox Nightly update finally introduced a new built-in download panel which is displayed on the top right and shows the time remaining until the download finishes:

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):

If you're not using Firefox Nightly and want to use the build-in Firefox PDF viewer, you can get the extension from HERE

Install Firefox Nightly in Ubuntu

sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa sudo apt-get update sudo apt-get install firefox-trunk

via 2buntu

There's also a(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. To add the official Firefox Nightly PPA and install it in Ubuntu, use the commands below in a terminal:users can use a repository to test Firefox and Thunderbird development builds - see http://mozilla.debian.net/