In smartpwpages.php, I changed the line for cookie duration to read
define( 'SECONDS_TO_STORE_PW', 30); // 864000 = 10 Days
This was an test to see if I could override the default 10 days to something on the order of 1 day. However, refreshing the page after a 1 minute wait still had the password stored in a cookie. Behavior was the same in Firefox 29 and IE 11.