tabtitles.user.js

// ==UserScript==
// @name         Tab Titles
// @namespace    https://vresod.github.io
// @version      1.0
// @description  Tab Titles is the not so perfect solution to giving custom title to tabs!
// @author       Vresod
// @include *
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var x = confirm('Would you like to change the tab title?')
    if (x == true){
    	var doctitle = prompt('To what?')
        setInterval(function(){
            document.title = doctitle
        }, 2)
    }
})();