Clicking on Confirmation Button (JS) using WWW::Mechanize::Firefox

[edimusrex]

I have run into a situation where I need to click on a js confirmation popup which running WWW::Mechanize::Firefox. I have read through the documentation and I didn't see anything that allows me to do so (I may have missed it). If any one knows a way to get past this it would be greatly appreciated. Here is the code thus far.

#!/usr/bin/perl

use warnings;
use strict;
use WWW::Mechanize::Firefox;
use Data::Dumper;

my $url = '<my_url>';
my $username = '<username>';
my $password = '<password>';

my $mech = WWW::Mechanize::Firefox->new('ssl_opts'=> {'SSL_verify_mode
+'=>0 }, autocheck => 0);
$mech->autoclose_tab( 0 );

$mech->get($url);
$mech->field(USERNAME => $username);
$mech->field(PASSWORD => $password);
$mech->click({ xpath => '//*[@id="loginButton"]' });

$mech->click({xpath => '//a[@onclick="changeTab(\'View Auto Attendants
+\', \'TelephonyControls\', \'ViewAutoAttendants\');return(false);"]' 
+});

### Fails here, obviously because confirmation_is is not a part of the
+ Mechanize::Firefox module but part of selenium.  Would like to use M
+echanize if at all possible.

$mech->confirmation_is("Click OK to View Auto Attendants, if you have 
+not saved your work, click Cancel and be sure to save it");