Readme.md

1. Download tampermonkey in you brower
2. now click on tamper monkey icon
3. and select create new script
4. and when a code editor opens up paste the code

tamper_monkey.js

// ==UserScript==
// @name         Video Speeder
// @namespace    randomnamespaceforusers
// @version      2024-05-22
// @description  control video playback in any site
// @author       leyuskc
// @match        *://*/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    let key_pressed = (key)=>{
        if (key=="S"){
            document.querySelectorAll("video").forEach(x => {if (!x.paused) {x.playbackRate += 0.25}})
        };
        if (key=="A"){
            document.querySelectorAll("video").forEach(x => {if (!x.paused) {x.playbackRate -= 0.25}})
        };
        if (key=="Z"){
            document.querySelectorAll("video").forEach(x => {if (!x.paused) {x.currentTime-=5}})
        };
        if (key=="C"){
            document.querySelectorAll("video").forEach(x => {if (!x.paused) {x.currentTime+=5}})
        };
        if (key=="Q"){
            document.querySelectorAll("video").forEach(x => {if (!x.paused) {x.pause()}else{x.play();}})
        };
        if (key=="D"){
            document.querySelectorAll("video").forEach(x => {x.muted=!x.muted})
        };


    };
    document.addEventListener('keyup', function(event) {
        if ('input' === document.activeElement.tagName.toLowerCase()) {
            return;
        }

        key_pressed(event.key);
    });
})();