FireFox: Warning: Unknown pseudo-class or pseudo-element 'eq'.

[jquery@…]

Not sure if this is a bug or what since I'm a noob but Firefox 3.6.12 on Mac and XP is complaining on the attributeEquals selector :eq. My code could be to blame :

 // turn button to on-state and make un-mousable if in section  

var level2= 1;

if(level2!=0){	
    $('.nav li:eq('+(level2-1) +')')
        .css({height:44})
        .children()
        .children()
        .css({ width:310,height:33, fontSize:"11px", marginLeft:-25, textIndent: 10 }); 

    // makes current subsection unmouseable 
    $('.nav li:eq('+(level2-1)+') a').unbind();
}

[jitter]

Thanks for taking the time to contribute to the jQuery project by writing a bug report but this isn't a bug.

FF just displays a warning not an error. This warning can be safely ignored.

There are many similar tickets on the bug tracker related to this misunderstanding.