// ==UserScript==
// @name Tabs Title Fix
// @namespace abu_pidor
// @match *://*.youtube.com/*
// @match *://*.spotify.com/*
// @run-at document-start
// ==/UserScript==

"use strict";
let regex;
const origDesc = Object.getOwnPropertyDescriptor(unsafeWindow.Document.prototype, "title");

switch (location.hostname.match(/[^.]+\.[^.]+$/)[0]) {
    case "youtube.com":
        regex = / - YouTube$/;
        break;
    case "spotify.com":
        regex = /^Spotify – /;
        break;
}

Object.defineProperty(unsafeWindow.Document.prototype, "title", {
    get: origDesc.get,
    set(title) {
        origDesc.set.call(this, cleanTitle(title, regex));
    }
});

document.addEventListener("DOMContentLoaded", () => {
    document.title = cleanTitle(document.title, regex);
});

function cleanTitle(title, regex) {
    return title.replace(regex, "");
}