Greasemoney-cpan-syntaxhighlighter-deprecated- is a project mainly written in JavaScript, it's free.
A greasemonkey script to extend cpan. Deprecated by metacpan and search.cpan.org it self
user-scripts
Matthias Ries, http://github.com/matthiasries
Copyright (c) 2010 Matthias Ries, all rights reserved.
the license may vary from file to file