The Guide shows you How to Install Firefox Nightly i686 Browser for Linux Lite 1.0.4 Precise Pangolin LTS Desktop.
The Firefox Nightly Version Coexists Perfectly with the Eventual Others Firefox Installations, this Meaning that an Unique Firefox Base Environment will be Shared between All the Firefox Versions on the System.
So to make easier the Visualization of the whole process the Guide includes the essential Screenshots.
Inside you find also detailed instructions about How to Create a Launcher for Firefox Browser on Ubuntu Unity Desktop.
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Download Firefox Nightly for Linux:
Firefox i686/x8664 tar.bz2
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Double-Click on Archive and Extract into /tmp

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Open a Terminal Window
(Press “Enter” to Execute Commands) 
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Relocate Firefox Nightly
Login as SuperUser.
sudo su
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Make a Firefox Directory.
mkdir /opt/firefox
Move Firefox Into firefox-Nightly so to Prepare for a Possible Firefox Multi-Version Coexistence
sudo chown -R root:root /tmp/firefox && mv /tmp/firefox /opt/firefox/firefox-nightly
Make a Symlink for Easy-Starting.
ln -s /opt/firefox/firefox-nightly/firefox /usr/local/bin/firefox-nightly
Next you Can Start Firefox from Terminal with
firefox-nightly
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Create a Custom Launcher for Easy-Starting:
Lite Xfce How Menu Launcher
How to Install Google-Chrome Web Browser for Linux-Lite:
Install Google-Chrome for Linux-Lite