mixiAutoOpenFriendProfile.user.js

// ==UserScript==
// @name           mixiAutoOpenFriendProfile
// @namespace      http://orezdnu.org/
// @include        http://mixi.jp/*
// ==/UserScript==

(function() {
    var link = document.getElementById('JS_show_more_profile');
    if (link) {
        var evt = document.createEvent('MouseEvents');
        evt.initMouseEvent('click', true, true, window,
                           0, 0, 0, 0, 0, false, false, false, false, 0, null);
        link.dispatchEvent(evt);
    }
})();