Greasy Fork is available in English.
Centers images and hides scrollbar and right panel
// ==UserScript==
// @name MangaDexCentered
// @namespace MangaDexCentered
// @version 1.0
// @description Centers images and hides scrollbar and right panel
// @author Owyn
// @match https://mangadex.com/chapter/*
// @match https://mangadex.org/chapter/*
// @run-at document-end
// @grant none
// ==/UserScript==
let i = setInterval(dojob, 100);
function dojob()
{
let img = document.querySelector("img.noselect");
if(img && img.naturalWidth) // loaded
{
document.querySelector(".reader-controls-wrapper").remove();
document.querySelector(".reader-main").classList.remove("reader-main");
document.documentElement.style.overflow = "hidden"; // hide scrollbar
document.body.style = "margin-right: -50px; padding-right: 50px; overflow-y: scroll; height: " +window.innerHeight+ "px;"; // wheel
let sheet = document.createElement('style');
sheet.innerHTML = ".reader.fit-horizontal .reader-images img { max-width: "+window.innerWidth+"px; }";
document.body.appendChild(sheet); // fix images not being 100% wide
setInterval(function(){document.body.focus();}, 100); // fix arrows and space buttons not working
clearInterval(i);
}
}