Just disable for web pages which roughly use CSS filter to the websites, update @match may needed to suit you personal usage.
// ==UserScript==
// @name Unfilter web pages
// @namespace http://tampermonkey.net/
// @version 1.0.2
// @description Just disable for web pages which roughly use CSS filter to the websites, update @match may needed to suit you personal usage.
// @author anonymous
// @match *://*/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
document.body.style.filter = 'none';
document.getElementsByTagName('html')[0].style.filter = 'none';
})();