/etc/apt/sources.list

I am a new Linux system admin user. How do I use apt command line utility for the package management on Ubuntu Linux LTS and Debian Linux server? How can I use the apt command for the package management? Can you provide apt command examples for new developers?
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My Debian Linux 6 (64 bit) has Epiphany installed which is the GNOME web browser. Epiphany aims to be simple to use and standards compliant but I want all other Firefox extensions. How do I install the latest version of Firefox 4 under Debian Linux version 6?
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