Greasemonkey script to make it easier to copy'n'paste review id

reviewboard-review-id-greasemonkey.js

// ==UserScript==
// @name        ReviewBoard - easy-to-copy review id
// @namespace   http://agateau.com/
// @description Insert the review id in a readonly input field next to the star image, making it easier to copy
// @include     https://*/r/*
// @grant       none
// @version     1
// ==/UserScript==

var elements = document.getElementsByClassName("star");
var star = elements[0];

var reviewId = star.getAttribute("data-object-id");

var label = document.createElement("span");
label.innerHTML = "Review <u>I</u>D:";
label.style = "padding-left: 1em";  

var input = document.createElement("input");
input.type = "text";
input.value = reviewId;
input.readOnly = true;
input.accessKey = "i";
input.onfocus = function() { this.select() };


star.parentElement.appendChild(label);
star.parentElement.appendChild(input);