I'm not sure how find the problem

Start with the docs listing the prerequisites and such, like http://search.cpan.org/dist/WWW-Mechanize-Firefox/INSTALL and WWW::Mechanize::Firefox::Installation, and WWW::Mechanize::Firefox::Troubleshooting

In reply to Re: Install WWW::Mechanize::Firefox Errors on Windows (docs) by Anonymous Monk
in thread Install WWW::Mechanize::Firefox Errors on Windows by leegold2

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