Can't get it work on FF 57

Hello! I have a problem with this script on FFF 57. I use GreaseMonkey and can't get the script work. Could you please check whether I understand your comments within the text right and whether I updated the script correct. I added @require line:

// @require https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.8/css/materialize.min.css

...and these 2 lines:

var materialize_CSS = GM_getResourceText ("materialize_CSS");
GM_addStyle(materialize_CSS);

Here's the first part of the code:

// ==UserScript==
// @name Gazelle Snatched
// @namespace Gazelle
// @description Mark snatched torrents across your favorite gazelle music trackers.
// @author Mordred
// @include https://*passtheheadphones.me/*
// @include https://*redacted.ch/*
// @include https://*apollo.rip/*
// @include https://*notwhat.cd/*
// @require https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.8/css/materialize.min.css
// @require https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_deleteValue
// @grant GM_xmlhttpRequest
// @grant GM_registerMenuCommand
// @grant GM_getResourceText
// @grant GM_addStyle
// @grant GM_log
// @version 2.2.2
// ==/UserScript==

(function () {
'use strict';

var chromeExtension = true;
var manifest;
var chromep;
var storageObj = { gazelle_snatched: {} };
if (!window.chrome || !chrome.extension) {
// not on chrome so do FF specific things
chromeExtension = false;
var materialize_CSS = GM_getResourceText ("materialize_CSS");
GM_addStyle(materialize_CSS);
manifest = GM_info.script;
} else {
manifest = chrome.runtime.getManifest();

Thank you very much in advance!

Kind Regards,
Alexander

...Just to let you know, a script works just fine with TamperMonkey but not with GreaseMonkey

Fixed for GM now too

Just checked the new version (2.3.2) - doesn't work on FF57... Reverting back to 2.2.2 and everything works like a charm... Checked on Apollo and NotWhat

...the latest version (2.3.3) works on all the indicated trackers as it should, thank you!