Tampermonkey script for Netflix which auto-selects the highest bitrate and sets the playback speed to 1.7x.

netflix_adjustments.js

// ==UserScript==
// @name         Netflix adjustments
// @version      0.1
// @author       RoliSoft
// @match        https://*.netflix.com/*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    GM_addStyle('\
        .player-timedtext-text-container > span { \
            color: rgb(255, 200, 0) !important; \
            font-family: "Segoe UI" !important; \
            /* text-transform: lowercase; */ \
        } \
    ');

    var previousVideoId = null;
    setInterval(function() {
        var videoId;
        try {
            videoId = document.querySelector('video[src^="blob:"]').src;
        } catch (err) {
            return;
        }

        if (videoId != previousVideoId) {
            console.log('New video detected.');
            previousVideoId = videoId;
            adjustments();
        }
    }, 100);

})();

function adjustments() {
    setPlaybackSpeed(1.7);
    setHighestBitrate();
}

function setHighestBitrate() {
    var kbEvent = new Event('keydown');
    kbEvent.keyCode = 83;
    kbEvent.ctrlKey = true;
    kbEvent.shiftKey = true;
    kbEvent.altKey = true;
    window.dispatchEvent(kbEvent);

    var waitStreamList = setInterval(function() {
        var streams = document.querySelector('.player-streams');
        if (streams) clearInterval(waitStreamList);
        else return;
        var streamList = streams.querySelectorAll('select[multiple=multiple]')[1];
        for (var i = 0; i < streamList.options.length; i++) {
            streamList.options[i].selected = i == streamList.options.length - 1;
            if (i == streamList.options.length - 1) {
                console.log('Setting bitrate to ' + streamList.options[i].text);
            }
        }
        var override = streams.querySelectorAll('button')[0];
        override.click();
    }, 100);
}

function setPlaybackSpeed(speed) {
    var vids = document.querySelectorAll('video');
    for (var i = 0; i < vids.length; i++) {
        console.log('Setting playback speed to ' + speed);
        vids[i].playbackRate = speed;
    }
}

Why the hell does it set the playback speed to 1.7? xD