Linux manual system installed Firefox browser

Most Linux distributions come with Firefox as the default browser, and can be easily installed from the software repository. For example:
Debian / Ubuntu: sudo APT-GET install Firefox

Fedora: sudo DNF install Firefox

OpenSUSE: sudo zypper install Firefox

Arch Linux: sudo pacman -S Firefox
but if you want to install two different Firefox on the same Linux system, You can manually download Firefox to install.
Step installation manual system Linux Firefox browser
first Chinese website to download Firefox to Firefox's tar.bz2 file. This document is not a tar.bz2 source code, but have compiled binaries. If you prefer to use the command line to download, use the following command:
64 System
wget http://download.firefox.com.cn/releases/firefox/45.0/zh-CN/Firefox-latest-x86_64.tar.bz2
32 bit systems
wget http://download.firefox.com.cn/releases/firefox/45.0/zh-CN/Firefox-latest.tar.bz2
after the download is complete, cd to the download directory, extract the tar.bz2 file.
xvf Firefox * .tar.bz2 tar

        the X-option indicates unzip (extract)
        v option indicates that display details of the run command (verbose)
        f option indicates that the target is a file (file), instead of a tape drive (tap drive).

After decompression, in the current directory will generate a firefox directory. These files are not the source code, but pre-compiled binaries, so we do not need to compile. There are a firfox next firefox directory script file is called. To start Firefox, as long as we execute firefox script on the line.
./firefox/firefox
If these binary files are saved in your home directory, then you can only run the manual installation of Firefox, so that other users can run, we move to Firefox binaries under / opt / directory.
sudo mv firefox / / opt
and then create a soft link, we called this Firefox firefox-new, to distinguish the system comes with firefox.
sudo ln -s / opt / firefox / firefox / usr / bin / firefox-new
next time, we can enter firefox-new command in a terminal to start firefox. If you do not want Firefox to display information in the terminal, you can also press ALT + F2 key, then enter the command firefox-new start firefox.
new new-Firefox
That's IT!

Enjoy!