Redmine Custom Font - User JS for Tampermonkey / Greasemonkey / Violentmonkey.

redmine-custom-font.user.js

// ==UserScript==
// @name         Redmine Custom Font
// @namespace    https://github.com/gustavomdsantos
// @version      1.0
// @description  Changes Redmine interface font to "Lato". Useful when "Helvetica" font (not suitable for screens) is installed on PC.
// @author       Gustavo Moraes ([email protected])
// @match        https://sistemas.agricultura.gov.br/redmine/*
// @icon         https://www.redmine.org/favicon.ico
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function() {
    const css = `
        body, input, textarea, select, button, table, th, td, h1, h2, h3, h4, h5, h6, div, span {
            font-family: "Lato", "Arial", sans-serif !important;
        }
    `;
    const style = document.createElement('style');
    style.textContent = css;
    document.documentElement.appendChild(style);
})();