There is no module named mechanize::firefox. You mean WWW::Mechanize::Firefox. Incorrect names, typos and case count, as described in one of your previous questions /WWW::Mechanize::Firefox how to install on opensuse 12.1. WWW::Mechanize::Firefox shows that JSON is a dependency, but you should actually read the documentation regarding JSON. If you are new to Perl and have the desire to learn please take the time to read and understand some of the folling:

In reply to Re: do i need json to run mechanize::firefox by marto
in thread do i need json to run mechanize::firefox by Perlbeginner1

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