Tampermonkey script for gerrit

gistfile1.js

// ==UserScript==
// @name         Gerrit code CSS
// @namespace    https://gist.github.com/kolyuchiy/17611ac0d022be45c633
// @version      0.1
// @description  enter something useful
// @author       You
// @match        http://johann.mail.msk:8081/
// @grant        none
// ==/UserScript==

(function () {
    var addGlobalStyle = function(css) {
        var head, style;
        head = document.getElementsByTagName('head')[0];
        if (!head) { return; }
        style = document.createElement('style');
        style.type = 'text/css';
        style.innerHTML = css;
        head.appendChild(style);
    };
    var removeVeryLongError = function(els) {
        if (els.length > 0 && els[0].textContent.match(/400 cannot create query for index/)) {
            els[0].textContent = "Ошибка :(";
        }
    };
    setTimeout(function () {
        addGlobalStyle(".CodeMirror pre { font-family: 'Ubuntu Mono' !important }");
        addGlobalStyle(".com-google-gwtexpui-safehtml-client-SafeHtmlCss-wikiPreFormat { font-family: 'Ubuntu Mono' !important }");
        addGlobalStyle(".com-google-gerrit-client-change-CommitBox_BinderImpl_GenCss_style-text { font-family: 'Ubuntu Mono' !important }");
    }, 1000);
    setInterval(function () {
        removeVeryLongError(document.getElementsByClassName('com-google-gerrit-client-change-RelatedChanges-RelatedChangesCss-tabPanel'));
    }, 1000);
})();