Mozilla’s UX-Nightly Build Of Firefox

The UX Nightly branch is the branch where developers can test out new features and experience them for a while before knowing if it’s something they want to ship.

Go to this page : http://people.mozilla.org/~jwein/ux-nightly/ ( or this one ) and download the appropriate build ( 32 or 64-bit, you can find out which one you need by going to Applications > System Settings > About ).
In my case it says : Version: 0.2 "Luna" ( 64-bit ).


Navigate to Downloads and open firefox-27.0a1.en-US.linux-x86_64.tar.bz2 with
Archive Manager ( just click on it ).
You will have a folder named firefox.
Assuming that you have installed and used firefox from the repositories before, I will rename the folder firefox  firefox-ux and move the folder to my home directory :
mv firefox/ ../firefox-ux
cd ../firefox-ux
./firefox -P

In the window that will open create a profile : call it ux  and start UX with this profile:

If all goes well....

Create a desktop file in ~/.local/share/applications with the following lines :
[Desktop Entry]
Version=1.0
Name=Firefox Ux
Exec=/home/username/firefox-ux/firefox -P "ux" --no-remote %u
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=/home/username/firefox-ux/browser/chrome/icons/default/default48.png
Categories=GNOME;GTK;Network;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
StartupNotify=true

Replace username with your username.....

The -no-remote switch will make it possible to run firefox with different profiles simultaneously ( see : http://kb.mozillazine.org/Command_line_arguments ).

Log out and in to see Firefox UX occur in Slingshot.