Userscript for Steam app pages, that appends a link to the title, which leads to the corresponding steamspy page.

steamspy_shortcut.js

// ==UserScript==
// @name         steamspy shortcut
// @namespace    http:/flatbutton.co/
// @version      1.0
// @author       Martin Knopf
// @match        http://store.steampowered.com/app/*
// @grant        none
// @require  https://cdnjs.cloudflare.com/ajax/libs/zepto/1.1.4/zepto.min.js
// ==/UserScript==

(function() {
    console.log('steamspy shortcut');
    var $ = Zepto;
    var pathParts = window.location.href.split('/');
    var appId = '';
    
    for(var i = pathParts.length-1; i >= 0; i--) {
        if(!isNaN(pathParts[i]) && pathParts[i] != "") {
            appId = pathParts[i];
            break;
        }
    }
    
    $('.apphub_AppName').append('<span style="font-size: 12px;vertical-align: middle;margin-left: 1em;">></span><a target="_blank" style="font-size: 12px;vertical-align: middle;margin-left: 1em;" href="http://steamspy.com/app/' + appId + '">open in steamspy</a>');
})();