Ajax search not workin in Firefox and tag error

Hello,

A couple of issues:

1) The search (using the magnifier icon) on the menu is not working in Firefox.

Website: http://www.bloisebuffet.com.br/novosite

I tested in Chrome and it works.

2) When I click on any tag created the result page brings me in the sidebar Latest news (Ultimas Noticias), two posts that does not exist and goes to a 404 page. I can~t find them to delete it… They are: 1777 and 1776

Please help!

Thank you,

Joelle