the link to the favicon was the issue.
in html_header.php i found the following custom code:
<?php if (defined('FAVICON')) { ?>
<link rel="icon" href="../../template_default/common/<?php echo FAVICON; ?>" type="image/x-icon" />
<link rel="shortcut icon" href="../../template_default/common/<?php echo FAVICON; ?>" type="image/x-icon" />
i change it back to default, to read:
<?php if (defined('FAVICON')) { ?>
<link rel="icon" href="<?php echo FAVICON; ?>" type="image/x-icon" />
<link rel="shortcut icon" href="<?php echo FAVICON; ?>" type="image/x-icon" />
and now the problem has been resolved.
totally amazing that only chrome got pissy about that. :censored: