les-mark-as-viewed-confirm.user.js

// ==UserScript==
// @name        LowEndSpirit.com - "Mark All Viewed" Confirmation
// @namespace   github.com/Decicus
// @match       https://lowendspirit.com/*
// @grant       none
// @version     1.0.1
// @author      Decicus
// @description Confirm whether you wanna mark all LES discussions as viewed.
// ==/UserScript==

function init() {
    const viewedButton = document.querySelector('.MarkAllViewed');

    // Can't find button - e.g. not logged in
    if (!viewedButton) {
        return;
    }

    let markAsViewed = false;
    viewedButton.addEventListener('click', function(ev) {
        if (markAsViewed) {
            return;
        }

        ev.preventDefault();
        ev.stopPropagation();

        if (!confirm('Confirm: Mark all viewed?')) {
            return;
        }

        markAsViewed = true;
        ev.target.click();
        markAsViewed = false;
    });
}

init();