You should be able to print to pdf from metacpan with firefox. If not there's a problem with your firefox or os. The issue with meta is no clean stylesheet for printing so there's irrelevant site navigation at the top and a pile of spam at the bottom of the document.

Also note that perldoc.perl.org provides pdf for core documentation.

This command line tool let's you type something like "perlpdf" instead of "perldoc":

perlpdf for perldoc as PDF