I wrote a user script.
2011/09/27 bug fix.
// ==UserScript==// @name cf_problem_desc// @version 0.1// @namespace http://mirror.codeforces.com/profile/wisterik// @description changes cf's problem_set link "?order=BY_SOLVED_DESC"// @include http://mirror.codeforces.com/*// @exclude http://mirror.codeforces.com/problemset?*// @include http://www.codeforces.com/* // @exclude http://www.codeforces.com/problemset?*// ==/UserScript ==(function() {var elem = document.evaluate("/html/body/div[3]/div[2]/div[5]/ul/li[4]/a", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null).snapshotItem(0);elem.href = elem.href + "?order=BY_SOLVED_DESC";})();