incognito => 0 option has be proven to be currently broken as Corion said (he is the author an, yes! he will fix it ;) also in a very recent post by me: some doubts on my first steps with WWW::Mechanize::Chrome and remember Super Search is our friend!

> please elaborate

If the chrome browser was started without options atm incognito will be always be the mode. But if you start chrome with the option --remote-debugging-port=9222 or manually or in your perl program, then you'll be able to connect to an existing instance and to an existing tab. I was prepaering the following example that shows what I mean:

use strict;
use warnings;

use Log::Log4perl qw(:easy);
use WWW::Mechanize::Chrome;
 
Log::Log4perl->easy_init($ERROR);  # Set priority of root logger to ER
+ROR

my $mech = connect_to_an_existing_tab();

unless ( $mech ){
    my $chrome_exe = choose_chrome_executable();
    start_new_instance( $chrome_exe )
}

print "broswer started or connected succesfully, listening on remote-d
+ebugging-port ".
        ${$mech->target()}{transport}{port}, " status ", 
        ${$mech->target()}{transport}{is_connected}    ? "connected" :
+ "not connected","\n";

sleep 3;
# go from Monastery Gates to Super Search
$mech->click (  { selector => '#titlebar-top  tbody  tr  td.monktitleb
+ar  ul  li:nth-child(16)  a'}  );

# the super search form
$mech->form_number( 2 );

# titles containing text field
$mech->field( 'HIT' => 'WWW::Mechanize::Chrome');


# not working: SUPPORT NEEDED HERE ;)
# 
# $mech->untick( 're', 'S' );
# $mech->tick( 're', 'N' );

# submit
$mech->click( { selector => '#id-3989 center table tbody tr td.main_co
+ntent form p:nth-child(17) input[type=submit]'} );


# ATTENTION:  autoclose was fixed recently:
# 
if ( $WWW::Mechanize::Chrome::VERSION < 0.56){
    print "Press ENTER to terminte ( autoclose => 0 fixed in version 0
+.56 of the module)".."\n";
    <STDIN>;
}


sub choose_chrome_executable{
    my( $chrome, $diagnosis ) = WWW::Mechanize::Chrome->find_executabl
+e();
    if ( $diagnosis ){
        print "problem finding chrome executable: $diagnosis\n";

    }    
    print "Should I use ",( $chrome ? "[$chrome]" : "-NOT FOUND-" ), "
+ or another executable (put full path or leave blank for default)\n";
    my $chrome_path = <STDIN>;
    chomp $chrome_path;
    $chrome_path = -e $chrome_path ? $chrome_path : $chrome;

    return $chrome_path;
}    

    
sub connect_to_an_existing_tab{
    print "I have to use an existing chrome tab by title( for example 
+PerlMonks )? leave it blank to open a new browser instance\n";
    my $tab_title = <STDIN>;
    chomp $tab_title;
    if ( $tab_title ){
        my $mech;
        {
            local $@;
            eval{
                $mech = WWW::Mechanize::Chrome->new(
                    mute_audio => 0,
                    autoclose => 0,
                    autodie => 0,
                    incognito => 0,
                    tab            => qr/$tab_title/,
                );
            };
            if ( $@ ){
                print "problem connecting to an already open tab in a 
+running instance of chrome:\n$@\n\n".
                        "close your running chrome instance and anothe
+r one will be started with right configuration\n".
                        "Press ENTER to continue..\n";
                <STDIN>;
                return 0;
            }
            return $mech;
        }
    }
    else { return 0 }
}

sub start_new_instance{
    my $chrome_exe = shift;
    print "I'll now open https://www.perlmonks.org  (will be in incogn
+ito mode despite incognito => 0)\n";
    my $url = 'https://www.perlmonks.org';
    
            $mech = WWW::Mechanize::Chrome->new(
            mute_audio => 0,
            autoclose => 0,
            autodie => 0,
            incognito => 0,
            launch_exe    => $chrome_exe,
            launch_arg => [ "--remote-debugging-port=9222" ]
        );
        $mech->get( $url );    
}
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