See the documentation of the ->value method in WWW::Mechanize::Firefox:

$mech->value( $textarea, 'BUY GENERIC VIAGRA' );

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In reply to Re^3: How to fill textarea of a webpage fetched using WWW::Mechanize::Firefox ? by Corion
in thread How to fill textarea of a webpage fetched using WWW::Mechanize::Firefox ? by strawperl

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