This userscript sets the focus to the Search textbox so you can start typing right away when you go to Amazon.com
// ==UserScript==
// @name Amazon Search Box Set Focus
// @version 1
// @grant none
// @description This userscript sets the focus to the Search textbox so you can start typing right away when you go to Amazon.com
// @author Tim Berneman
// @include http*://*.amazon.com/*
// @namespace https://greasyfork.org/users/14590
// ==/UserScript==
document.getElementById("twotabsearchtextbox").focus();