marto@Shemp:~/code$ cat ff.pl 
#!/usr/bin/perl

use strict;
use warnings;

use WWW::Mechanize::Firefox;

my $mech = WWW::Mechanize::Firefox->new();
$mech->get('http://perlmonks.org');

##</code><code>##

marto@Shemp:~/code$ pp -vvv --log=pp_no_x.log -o ff_no_x ff.pl

##</code><code>##

marto@Shemp:~/code$ pp -vvv --log=pp_with_x.log -x -o ff_with_x ff.pl

##</code><code>##

marto@Shemp:~/code$ diff pp_no_x.log pp_with_x.log 
2c2
< /usr/local/bin/pp: Writing PAR on /tmp/ppaOyYR.par
---
> /usr/local/bin/pp: Writing PAR on /tmp/ppLLOin.par
180a181
> /usr/local/bin/pp: ... adding /usr/lib/i386-linux-gnu/perl/5.22.1/Storable.pm as lib/Storable.pm
296a298
> /usr/local/bin/pp: ... adding /usr/lib/i386-linux-gnu/perl/5.22.1/attributes.pm as lib/attributes.pm
394a397
> /usr/local/bin/pp: ... adding /usr/lib/i386-linux-gnu/perl/5.22/auto/Storable/Storable.so as lib/auto/Storable/Storable.so
396a400
> /usr/local/bin/pp: ... adding /usr/lib/i386-linux-gnu/perl/5.22/auto/attributes/attributes.so as lib/auto/attributes/attributes.so
603a608
> /usr/local/bin/pp: ... adding <string> as lib/Storable.pm
719a725
> /usr/local/bin/pp: ... adding <string> as lib/attributes.pm
817a824
> /usr/local/bin/pp: ... adding /usr/lib/i386-linux-gnu/perl/5.22/auto/Storable/Storable.so as lib/auto/Storable/Storable.so
819a827
> /usr/local/bin/pp: ... adding /usr/lib/i386-linux-gnu/perl/5.22/auto/attributes/attributes.so as lib/auto/attributes/attributes.so
851c859
< /usr/local/bin/pp: *** /tmp/ppaOyYR.par: 2141174 bytes read, 1823518 compressed, 14% saved.
---
> /usr/local/bin/pp: *** /tmp/ppLLOin.par: 2246924 bytes read, 1873647 compressed, 16% saved.
853c861
< /usr/local/bin/pp: Running /tmp/parl0GIttki -Lff_no_x.log -B -Off_no_x /tmp/ppaOyYR.par
---
> /usr/local/bin/pp: Running /tmp/parleAdFI2Q -Lff_with_x.log -B -Off_with_x /tmp/ppLLOin.par
856,859c864,865
< Packing "Config_git.pl"...
< Written as "Config_git.pl"
< Packing "Config.pm"...
< Written as "Config.pm"
---
> Packing "Config_heavy.pl"...
> Written as "Config_heavy.pl"
861a868,869
> Packing "Config_git.pl"...
> Written as "Config_git.pl"
864,865c872,873
< Packing "Config_heavy.pl"...
< Written as "Config_heavy.pl"
---
> Packing "Config.pm"...
> Written as "Config.pm"