Sticky navigation element jumps during scroll

Question

In Firefox especially, I\'ve run into an issue I can\'t figure out how to fix.

On the following page, when scrolling down the page jumps several times - mainly on s

Answer 1

I solved the problem differently so on firefox as you can see in logs it scroll up itself so to stop this scrolling I made simple statement

$(document).ready(function () {
        var header = $('#left-menu');
        var offset = header.offset().top;
        var up = true;
        $(window).scroll(function () {
            var scroll = $(window).scrollTop();
            console.log(scroll + ' ' + offset )
            if (scroll >= offset) {
                header.addClass('sidebar-sticky');
                if (up){
                    $(window).scrollTop(offset);
                    up=false;

                }


            } else {
                up=true;
                header.removeClass('sidebar-sticky');
            }
        });


    });

that solution work for me when I can't specify height of div's I use.