I have the US version of Firefox installed from the package manager but cannot find the UK version available. Is it possible to install from a package manager. I have downloaded the uk version from Mozilla as a tar.bz. How do I install that please?
And if you want to localize everything at once and not just firefox, just go to Settings-Manjaro Settings Manager and install the proper locale and language packages.
p.s. As a beginner/non-experienced user, avoid installing (read: don’t do it) .tar.gz, .run or .sh installers downloaded from web sites, especially do not run there with sudo.