in reply to Feature Request: Adding Colors to Source Code
An alternate approach, that would probably be a lot simpler to impliment, but could help this use case -- as well as may others -- would be to add a single User Setting for controlling the mime/type returned when using "displaytype=displaycode" (ie: when clicking the Download COde" link).
This way, people could change their user setting to use "text/plain+perlmonks_code" as the mime type, and then configure their browser to use any app of their choice as a helper for that mime/type. Clicking "Viewing Code" would then launch that app -- which could colorize, be an editor, let them run the code in a debugger at the click of a button, whatever they want.
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Perl Monks Discussion