If you want to get the latest version of Firefox, there is a convenient repository available which repacks and distributes the latest official Mozilla builds.
The “sources.list” in Ubuntu is an important file that contains all your software repository information. What if, on a fresh install of Ubuntu, you discover that your “sources.list” is empty? Or you need to change the whole repository to one that is specific to your country? Here is how you can generate a new sources list file easily without being a Ubuntu expert.