[Plugin: Console] I get no output

The usage instructions are… a bit thin, so I tried this:

• Install & activate plugin
• Copy sample code <?php console( $var ); ?> to end of footer.php (no instructions included as to where this insertion works best)
• Copy Krumo code to functions.php
• Reload the front page & check the console (Chrome)

Empty on all accounts – so what am I doing wrong? I’ve use var_dump and get_defined_vars with no problem, but this one has me stumped.

http://ww.wp.xz.cn/extend/plugins/console/