[Jquery] render different between Chrome and Firefox

Hi everybody, im newbie in magento and start build my website 10day ago with magento community 1.8
today when i install facebook comment extension in this link: magentocommerce.com/magento-connect/all4coding-facebook.html
extension work but something wrong when extension display in frontend. i think JQ dont working correctly
look at the picture i attchments. this error description in there.