slow_down_wheel_events.js

Enable keyboard shortcuts

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

if (new WheelEvent("test", { deltaY: 30 }).deltaY == 30) {

  window.__webcompat ??= new Set();

  const proto = WheelEvent.prototype;

    const desc = Object.getOwnPropertyDescriptor(proto, "deltaY");

    const { get } = desc;

    desc.get = function () {

      return get.call(this) / 30;

};

    Object.defineProperty(proto, "deltaY", desc);

    window.__webcompat.add("WheelEvent.deltaY");

    const desc = Object.getOwnPropertyDescriptor(proto, "wheelDeltaY");

    const { get } = desc;

    desc.get = function () {

      return get.call(this) / -40;

};

    Object.defineProperty(proto, "wheelDeltaY", desc);

    window.__webcompat.add("WheelEvent.wheelDeltaY");