deezer_title.js

// ==UserScript==
// @name        deezertitlefix
// @namespace   deezer
// @description deezer!
// @include     https://www.deezer.com/*
// @exclude     https://www.deezer.com/*/playlist/*
// @version     1
// @run-at     load
// @grant       GM_addStyle
// ==/UserScript==
/*- The @grant directive is needed to work around a design change
    introduced in GM 1.0.   It restores the sandbox.
*/

var proper_title = "Deezer: ";
var orig_url = location.href;

if (location.href.indexOf("/search/") == -1) {

// artist
  var deezatttl = "music.album";
if (document.querySelector('meta[property="og:type"]').getAttribute("content").indexOf(deezatttl) != -1 ) {
  proper_title += document.querySelector('meta[name="twitter:description"]').getAttribute("content") + " - " + document.querySelector('meta[property="og:title"]').getAttribute("content");
}
// title/album
  var deezalbttl = "music.musician";
if (document.querySelector('meta[property="og:type"]').getAttribute("content").indexOf(deezalbttl) != -1 ) {
  proper_title += document.querySelector('meta[property="og:title"]').getAttribute("content");
}
  
} else {
  var search_query = location.href.split("/");
  proper_title = "Deezer " + search_query[5] + " search: " + search_query[4].replace(/\+/g, " ").replace(/\%20/g, " ");
  
}

setInterval(function(){ 
  
  if (document.title != proper_title) {
    document.title = proper_title.replace(" (new album)", "");
  }
  
  if ( location.href != orig_url ) {
    window.location.reload(false);
    // var fuck_javascript=true;
    
  }

},10000);