Open file /incfiles/classes/bbcode.php.
Go function hightlight_url(); search:
PHP:
return $whitespace . '<a href="' . $url . '">' . $text . '</a>' . $append;
Change all
PHP:
return $whitespace . '<a href="' . $url . '" target="_blank">' . $text . '</a>' . $append;
Save and test !
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