STOP THE PRESSES! IT WORKED:

From the shell, I failed to start chromium with --remote-debugging-port=9222

So I guess, in a script, I can spawn chromium headless, then run the per script and attach to it! It just might work! THANKS!

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OK, my code is now:

use Log::Log4perl qw(:easy);
use WWW::Mechanize::Chrome;
 
Log::Log4perl->easy_init($ERROR);
my $mech = WWW::Mechanize::Chrome->new(
    headless => 0,
#    start_url => 'https://grocery.walmart.com/orders',
    data_directory => '/home/rwk/chrome-session-for-walmart',
    incognito => 0,
    launch_exe => '/usr/bin/chromium',
    javascript => 1,
    launch_arg => [ "--remote-debugging-port=9222" ],
    tab => qr/Walmart Grocery/,
    );
my $txt = $mech->content;
open($f, '>', '/tmp/out.html');
print $f $txt;
close $f;
[download]

I start the browser manually and load https://grocery.walmart.com/orders

It correctly logs in and display my order page.

The page Title shows "Walmart Grocery".

I run my script above and get:

error when connectingInternal Exception at /usr/local/lib64/perl5/5.30
+.1/WWW/Mechanize/Chrome.pm line 993.
[download]

Please advise...