Firefox scrollTop problem

Question

I have a problem with Firefox scrollTop value and onscroll event. This works great in IE, Safari and Chrome but Firefox seems to lag.

I tried to update some background p

Answer 1

var last = +new Date;

function SaveScrollLocation () {
    var now = +new Date;
    if (now - last > 50) {
      // ...
      last = now;
    }
}

window.onscroll = SaveScrollLocation ;