Just came across a temporary fix that worked for me at http://ww.wp.xz.cn/support/topic/lightbox-2-doesnt-work-in-firefox-with-wp-31?replies=22
Replace the new /wp-includes/js/jquery/jquery.js with one from an older version or WordPress – I used jquery.js from 3.04 and it works like a charm!
P.J.
Looks like I sorted it out… just need to change the line:
jQuery(‘.car-collapse’).find(‘.car-monthlisting:first’).show();
to
jQuery(‘.car-collapse’).find(‘.car-monthlisting:first’).hide();
Looking good…