It is possible to re-implement wxLaunchDefaultBrowser in perl see, something like this (untested) 
use File::Which::Cached 'which'; 
sub OpenBrowser {
    my ( $url ) = @_;
    my @cmd = GetBrowserCmd();
    system @cmd, $url;
}
sub GetBrowserCmd {
    if( $^O =~ /win32/ ){
        return 1, qw'cmd /x /c start';
    }
    elsif( $^O =~ /mac|darwin/ ){
    }
#~     else
    {
        my $xdg = which("xdg-open");
        if( -e $xdg and -x _ ){
            return $xdg;
        }
#~ http://stackoverflow.com/questions/3743693/macro-detect-kde-or-gnom
+e-in-qt4
#~ KDE_FULL_SESSION variable whereas GNOME has the DESKTOP_SESSION var
+iable set to "gnome".
        if ( eval { $ENV{DESKTOP_SESSION} =~ /gnome/i } ){
            my $exe = qx{gconftool-2 --get /desktop/gnome/applications
+/browser/exec};
            if( -e $exe and -x _ ){
                return $exe;
            }
        }
        elsif( exists $ENV{KDE_FULL_SESSION} ){
            my $kfmclient  = which("kfmclient");
            if( -e $kfmclient and -x _ ){
                return $kfmclient;
            }
        }

        if( eval { require Mail::Cap; 1} ){
#~ http://tools.ietf.org/html/rfc1524# RFC 1524 - A User Agent Configu
+ration Mechanism For Multimedia Mail Format Information
            for my $mailcap (
                "$HOME/.mailcap",
##        "$HOME/.mime.types", ## ?? outdated wxMimeTypesManager info
## File::BaseDir - Use the Freedesktop.org base directory specificatio
+n
                qw[ /etc/mailcap
                /usr/etc/mailcap
                /usr/local/etc/mailcap ]
                ){
                my $cmd = Mail::Cap->new($mailcap)->viewCmd('text/html
+');
                if( -e $cmd and -x $cmd ){
                    return $cmd;
                }
            }
        }
    }
}

[download]
update: although it look like someone already thought of this idea, just pick one or more of the following

In reply to Re^2: LWP to open a new browser window by Anonymous Monk
in thread LWP to open a new browser window by remya

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