YouTube: Disable the sticky ability of the search bar.

yt-relative-header.user.js

// ==UserScript==
// @name          YouTube: Relative Header
// @namespace     https://gist.github.com/CairX
// @description   Disable the sticky ability of the YouTube search bar.
// @include       https://www.youtube.com/*
// @version       0.1
// @grant         none
// @noframes
// ==/UserScript==

var positioner = document.getElementById("masthead-positioner");
positioner.style.position = "relative";
var spacer = document.getElementById("masthead-positioner-height-offset");
spacer.style.display = "none";