Kill sticky headers.

kill-sticky.js

// ==UserScript==
// @name         Kill Sticky Headers (Ctrl/Cmd+Shift+K)
// @homepage     http://alisdair.mcdiarmid.org/kill-sticky-headers/
// @version      0.1
// @description  Kill sticky headers
// @match        *://*/*
// @grant        none
// ==/UserScript==

function killSticky() {
	var elements = document.querySelectorAll('body *');

	for (var i = 0, len = elements.length; i < len; ++i) {
		var element = elements[i];

		if (getComputedStyle(element).position === 'fixed') {
			element.parentNode.removeChild(element);
		}
	}
}

window.addEventListener('keydown', function (e) {
	if (e.shiftKey && (e.ctrlKey || e.metaKey) && e.keyCode === 75 /* k */) {
		killSticky();
	}
});