Use the mouse wheel to navigate between plan pages (down = next, up = previous)

RaidPlanPageScrolling.user.js

// ==UserScript==
// @name         RaidPlan.io - Mouse Wheel Navigation
// @namespace    https://gist.github.com/natyusha
// @version      1.0.0
// @description  Use the mouse wheel to navigate between plan pages (down = next, up = previous)
// @match        https://raidplan.io/plan/*
// ==/UserScript==

(function() {
    'use strict';

    window.addEventListener('wheel', function(e) {
        const isNext = e.deltaY > 0;
        const key = isNext ? 'ArrowRight' : 'ArrowLeft';

        // Create keyboard event that mimics pressing left/right arrow
        const event = new KeyboardEvent('keydown', {
            key: key,
            code: key,
            keyCode: isNext ? 39 : 37,
            which: isNext ? 39 : 37,
            bubbles: true,
            cancelable: true
        });

        // Dispatch on document
        document.dispatchEvent(event);

        // Optional: prevent the wheel from scrolling the whole page
        // (uncomment only if the page itself scrolls annoyingly when using the wheel)
        // e.preventDefault();

    }, { passive: false });

})();