Userscripts.org

// ==UserScript==
// @name           Yahoo Tracking Disabler
// @namespace      http://userscripts.org/users/23652
// @description    Disables link tracking on Yahoo
// @include        http://*.yahoo.com/*
// @copyright      JoeSimmons
// @version        1.0.0
// @license        Creative Commons Attribution-Noncommercial 3.0 United States License
// ==/UserScript==

var regex = /\;?_(ylt|ylu=)[^;]*\;/gi;

function main() {
var links = window.document.evaluate("//a[contains(@href, 'ylt=') or contains(@href, 'ylu=')]",window.document,null,6,null);
if(links.snapshotLength>1) for(var i=links.snapshotLength-1; (link=links.snapshotItem(i)); i--) {
link.href = link.href.replace(regex,'');
}
}

var intv = setInterval(main, 250);