TwinStar

twinstar.user.js

// ==UserScript==
// @name         Twinstar
// @match        http://*.twinstar.cz/*
// @match        https://*.twinstar.cz/*
// ==/UserScript==

(function() {
    'use strict';

    var re = /https?:\/\/(www\.)?wowhead.com\//;

    document.body.addEventListener('mousedown', function(el) {
        var targ = el.target || el.srcElement;
        while (targ && targ.tagName !== 'A') {
            targ = targ.parentNode;
        }
        if (targ && targ.href && targ.href.match(re)) {
            targ.href = targ.href.replace(re, 'https://classic.wowhead.com/');
        }
    });
})();