You may want to look through the questions (and especially the answers) of Perlbeginner1 who had very similar problems as you have.

Basically, your problem is with installing Mozrepl first. I recommend you force-install it.

In reply to Re^3: how to install Mecha :: FF with Mozrepl by Corion
in thread how to install Mecha :: FF with Mozrepl by Anonymous Monk

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