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YouTube Volume Fixer

Makes the YouTube volume slider exponential for easier adjustment of lower volumes.

// ==UserScript==
// @name         YouTube Volume Fixer
// @namespace    http://tampermonkey.net/
// @version      1
// @description  Makes the YouTube volume slider exponential for easier adjustment of lower volumes.
// @author       zGqnis
// @icon         https://www.gstatic.com/youtube/img/branding/favicon/favicon_144x144.png
// @match        https://www.youtube.com/*
// @match        https://music.youtube.com/*
// @run-at       document-start
// @grant        none
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    const EXPONENT = 3;

    const storedOriginalVolumes = new WeakMap();
    const {get, set} = Object.getOwnPropertyDescriptor(HTMLMediaElement.prototype, 'volume');

    Object.defineProperty(HTMLMediaElement.prototype, 'volume', {
        get() {
            const lowVolume = get.call(this);
            const calculatedOriginalVolume = lowVolume ** (1 / EXPONENT);

            const storedOriginalVolume = storedOriginalVolumes.get(this);
            const storedDeviation = Math.abs(storedOriginalVolume - calculatedOriginalVolume);

            const originalVolume = storedDeviation < 0.01 ? storedOriginalVolume : calculatedOriginalVolume;
            return originalVolume;
        },
        set(originalVolume) {
            const lowVolume = originalVolume ** EXPONENT;
            storedOriginalVolumes.set(this, originalVolume);
            set.call(this, lowVolume);
        }
    });
})();