My community, search, and quicklinks dropdown menus arent working
 

For some reason my community, search, and quicklinks dropdown menus arent working anymore. I checked the code several times, reverted it, and it still doesnt seem to work. Also this seems to be only a problem on Firefox. They seem to work on Internet Explorer. Also there seems to be a few differences when viewing my site on Firefox and IE. Some of the navbar options do not show up in IE. Does anyone know what the problem is? Thanks! My site is www.ponyforums.com