title

highlight_blacklist_tags.user.js

// ==UserScript==
// @name         Highlight blacklist tags
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://e621.net/post/show/*
// @grant        none
// ==/UserScript==

const bl_tags = document.cookie
    .split(';')
    .map(e => e.split('='))
    .filter(e => e[0] == ' blacklisted_tags')[0][1]
    .split('&')
    .map(decodeURIComponent)
    .map(e => e.toLowerCase().replace((/_/g), ' '));

Array.from(document.querySelectorAll('#tag-sidebar a')).forEach(node => {
    const val = node.innerText;
    if(bl_tags.includes(val)){
        node.style.setProperty('color', 'lime', 'important');
    }
})