I want to install mozrepl on OpenSUSE version 12.1. It gets pretty tricky – note Mozrepl is a additional part that is needed by the WWW::Mechanize::Firefox::
I had a bunch of troubles with mozRepl – and I tried to follow the first 3-4 steps from CPAN. I tried to install it with zypper in or with the repo: https://github.com/bard/mozrepl.github
See many good links and ressources regarding Mechanize – Firefox – Troubleshooting
https://duckduckgo.com/html/?q=mozrepl
https://github.com/bard/mozrepl.github
MozRepl is a plugin in firefox. You need to install it from Mozilla AppStore.
Do you tried to install from https://addons.mozilla.org/en-US/firefox/addon/mozrepl/?