What is the problem?

Scripts don't work on nhentai.net

How to reproduce it?

1. Sample script

// ==UserScript==
// @name        New script - nhentai.net
// @namespace   Violentmonkey Scripts
// @match       https://nhentai.net/*
// @grant       none
// @version     1.0
// @author      -
// @description 5/10/2020, 11:47:09 PM
// ==/UserScript==

(function() {
  alert("test");
  console.log("test");
 })();

2. Open page like https://nhentai.net/g/312760/2/

What is the expected result?

An alert should appear also test should appear in the console

What is the actual result?

None of the behaviors appear. Console log:

Environment

• Browser: Firefox
• Browser version: 76.0.1
• Violentmonkey version: v2.12.7
• OS: Windows

Other comments:

Windows Edge (Chromium core) with violentmonkey have similar issue. Edge with Tampermonkey works but the console log keeps refreshing. If I use ublock origin to block the script https://static.nhentai.net/js/combined.1d8cbb9eacc7.js, violentmonkey works properly