$ is not defined?

fixed.js

jQuery(document).ready(function ($) {
  $.fn.scrollBottom = function() {
		return $(document).height() - this.scrollTop() - this.height();
	};

	jQuery(window).scroll(function ($) {
		var offset = $('#main').offset(); //<--- Top of the element where the scroll should start
		var docViewTop = $(window).scrollTop();//<--- Top of the window
		var docViewBottom = docViewTop + $(window).height(); //<--- Bottom of the window
		var elemTop = $('#footer').offset().top; // <-- This is the top of the element that we are testing if it has come into view
		if ($(window).scrollTop() > offset.top && docViewBottom < elemTop) { //<-- This adds the floating class if the top of the window reaches the element and the other element is not in view
			$('.breadcrumbs').addClass('fixed');
		} else {
			$('.breadcrumbs').removeClass('fixed');
		}
		$(window).unbind('scroll');
	});
});