A search on CPAN for WWW Mechanize Javascript turns up:

  1. WWW::Mechanize::Plugin::JavaScript
  2. WWW::Mechanize::Firefox
  3. WWW::Mechanize::PhantomJS

You may also want to look at

In reply to Re^4: using WWW::Mechanize to adress fields by Corion
in thread using WWW::Mechanize to adress fields by Anonymous Monk

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