It is hard for me to believe that zypper doesn’t have a WWW::Mechanize::Firefox package. Also, your distro should contain every information on how to set up your system (if it isn’t already) to deal with manual installations through CPAN or more modern interfaces such as cpanm. Also, I do not believe you should be creating new threads to ask more or less the same thing again.

Complaints aside: yes, your assumptions that the installation of W:M:Ff wasn’t successful, are correct. It indeed wasn’t. Try again.