// ==UserScript==
// @name         AMZ colors count
// @include     /^https?://www\.amazon(\.com?)?\.[a-z]{2,3}/.*$/
// @namespace     /^https?://www\.amazon(\.com?)?\.[a-z]{2,3}/.*$/
// ==/UserScript==

(function() {
    document.querySelector("#productTitle").innerHTML += "<strong style='display: block'>Kolory: <span style='color: #ff2b55'>" + document.querySelectorAll("#variation_color_name li").length + "</span></strong>";
}())