Why does CSS make links inactive in Firefox?

Question

I am checking Firefox 3.6

Why 2nd level links are not available in this tab menu.

alt text http://shup.com/Shup/383239/11061405615-My-Desktop.png

live example here: http://jsbin.com/upeka4/5

it can be clicked if you disable css

Answer 1

Perhaps because the definition is z-indexhere:

ul.level2  {
background:none repeat scroll 0 0 #F3F8C6;
border:1px solid #EABF4A;
left:0;
padding:6px;
position:absolute;
top:30px;
width:463px;
z-index:-1; <------------------------ there
}

Answer 2

Your problem z-index: -1

Answer 3

z- ul.level2 -1, . IE , firefox , .

Answer 4

. :

#tabcontainer
        {
          height:32px;
          position:absolute;
          margin: 2em;
          font-size: 12px;
        }

32px , "" , , ( "" z-). position:absolute; , tabcontainer, (, html, body).