我目前的解决方案是写了一个油猴的脚本
// ==UserScript==
// @name 飞牛浏览器标题修改
// @version 1.0.2
// @namespace https://github.com/g0ngjie/tkscript/fnos/index.js
// @match *://*.5ddd.com/*
// @match *://*.fnos.net/*
// @match *://fn.*.com/*
// @grant none
// @author Gj
// @license MIT License
// @description 2025/6/23 10:46:16
// @downloadURL https://update.greasyfork.org/scripts/540471/%E9%A3%9E%E7%89%9B%E6%B5%8F%E8%A7%88%E5%99%A8%E6%A0%87%E9%A2%98%E4%BF%AE%E6%94%B9.user.js
// @updateURL https://update.greasyfork.org/scripts/540471/%E9%A3%9E%E7%89%9B%E6%B5%8F%E8%A7%88%E5%99%A8%E6%A0%87%E9%A2%98%E4%BF%AE%E6%94%B9.meta.js
// ==/UserScript==
(function () {
'use strict';
const rTitle = '百度一下'
const rIco = "https://www.baidu.com/favicon.ico";
let favicon = document.querySelector('link[rel="icon"]');
if (!favicon) {
favicon = document.createElement('link');
favicon.rel = 'icon';
document.head.appendChild(favicon);
}
favicon.href = rIco;
const targetNode = document.querySelector('title');
const observer = new MutationObserver(function (mutations) {
mutations.forEach(function (mutation) {
console.log('Title changed to:', mutation.target.textContent);
if (mutation.target.textContent != rTitle) document.title = rTitle
});
});
const config = {
subtree: true,
characterData: true,
childList: true
};
observer.observe(targetNode, config);
}());
效果如下:

希望原生支持,无需第三方插件去修改