perl -d:Modlist foobar.pl
...

AutoLoader             5.63
Carp                   1.04
Config
DynaLoader             1.05
Exporter               5.58
HTML::Element          3.16
HTML::Entities         1.29
HTML::Parser           3.45
HTML::Tagset           3.04
HTML::TreeBuilder      3.13
integer                1.00
vars                   1.01
warnings               1.03
warnings::register     1.00