Useful for emote servers. Whenever there's an unread message in a guild, this script will automatically mark it as read.

discord.autoreadguilds.user.js

// ==UserScript==
// @name        Discord Auto Mark As Read Guilds
// @description Useful for emote servers. Whenever there's an unread message in a guild, this script will automatically mark it as read.
// @namespace   Violentmonkey Scripts
// @grant       GM_addStyle
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js
// @require     https://raw.githubusercontent.com/pie6k/jquery.initialize/master/jquery.initialize.min.js
// @match       *://discordapp.com/*
//
// ==/UserScript==

var ignore_guild_ids = [
    "210989405286957059"
];

$(".badge").initialize( function(){
    jQuery.fn.simulateClick = function() {
        return this.each(function() {
            if('createEvent' in document) {
                var doc = this.ownerDocument,
                    evt = doc.createEvent('MouseEvents');
                evt.initMouseEvent('contextmenu', true, true, doc.defaultView, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
                this.dispatchEvent(evt);
            }
        });
    };

    var guild_item = $(this).parent().find('a').eq(0);
    var guild_id = $(guild_item).attr('href').split('/')[2];

    if ($.inArray(guild_id, ignore_guild_ids) === -1){
        $(guild_item).simulateClick('contextmenu');
        setTimeout(function(){
            var context_menu = $("div [class^='context-menu']");

            var mark_read_item = $(context_menu).find(".item").eq(0);
            mark_read_item.trigger('click');

            $(guild_item).simulateClick('contextmenu');

            setTimeout(function(){
                context_menu = $("div [class^='context-menu']");

                var mute_bug_fix = $(context_menu).find(".item").eq(1);
                $(mute_bug_fix).simulateClick('contextmenu');
            }, 10);

        }, 10);
        console.log("Unread badge was detected, marked guild with id '" + guild_id + "' as read");
    }
});