If you're not sold on WWW::Mechanize::Firefox, you can use phantomjs for "headless" screenshots. here's an example script. Note that this is based on a different rending engine (Webkit, whereas firefox uses Gecko).

Perl 6 - second systems done right

In reply to Re: page screenshot using www::mechanize::firefox by moritz
in thread page screenshot using www::mechanize::firefox by satyashani

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