Input Focus Title Change

InputFocusTitleChange.user.js

// ==UserScript==
// @name InputFocusTitleChange
// @namespace http://igalvez.net
// @include *
// @author Izzy Galvez (iglvzx)
// @description Adds/Removes '[AHK]' to the Title when an input/textarea element gains/loses focus.
// @version 1.0
// ==/UserScript==

// Import jQuery
function addJQuery(callback) {
    var script = document.createElement("script");
    script.setAttribute("src", "https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js");
    script.addEventListener('load', function() {
        var script = document.createElement("script");
        script.textContent = "(" + callback.toString() + ")();";
        document.body.appendChild(script);
    }, false);
    document.body.appendChild(script);
}

// Script
function main() {

    var title = document.title;
    
    var elements = ['input', 'textarea'];

    for (var i = 0; i < elements.length; i++) {
        $(elements[i]).each(function() {

            $(this).focus(function() {
                document.title = title + ' [AHK]';
            });

            $(this).blur(function() {
                document.title = title;
            });
        });
    }
}

// Run
addJQuery(main); 

See: http://superuser.com/a/442846/100787