bug1903480-ace7.acecombat.jp-slow-down-scrolling.js

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/* 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";

/**

 * Bug 1903480 - Ace Combat 7's site wheel-scrolls ridiculously quickly.

 * The site is intentionally scaling the value of wheel event deltaY by 30

 * on Firefox. We can undo that here.

*/

/* globals exportFunction */

console.info(

  "wheel events are being scaled down for compatibility reasons. See https://bugzilla.mozilla.org/show_bug.cgi?id=1903480 for details."

);

const proto = window.wrappedJSObject.WheelEvent.prototype;

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

const { get } = descriptor;

descriptor.get = exportFunction(function () {

  const value = get.call(this);

  return value / 30;

}, window);

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