Firefox 4.0 Final stable version released today opening a completely new browsing experience for all internet addicts. For Linux users its a new convenience that the browser gets updated automatically without any Terminal updates keeping it safe from bugs and threats.

Here you can install Firefox 4.0 without using a repository, a Terminal command to install this version while keeping the previous version.

Ubuntu x86

wget http://dl.dropbox.com/u/964512/lfflfirefox/firefox_4.0_i386
chmod +x firefox_4.0_i386
./firefox_4.0_i386

Ubuntu x64

wget http://dl.dropbox.com/u/964512/lfflfirefox/firefox_4.0_amd64
chmod +x firefox_4.0_amd64
./firefox_4.0_amd64

Alternatively, you can test / install the new Firefox 4.0 on Ubuntu or any other Linux distributions just downloading the file. tar.bz2 from links below.

Download Firefox 4.0 x86
Download Firefox 4.0 x64