For an example, I have this yt-player-quality value for www.youtube.com domain in my firefox local-storage which saves the visitor's youtube player quality.

The value has set to: {"data":"medium","expiration":1538035321798,"creation":1535443321798}

which means next time I play a youtube video, it loads with quality 360p (possible values are: large=480p,medium=360p, small=240p, tiny=144p)

I want to freeze it's value to large in my browser. So even If I delete my browser data, It always load the quality 480p. I don't like always logged in to youtube.com. I always clean cookies and data. I only need this specific local-storage value in my browser. Is there any Firefox extension to make this possible?


This greasemonkey script did the trick.

It re-creates the local-storage value everytime I load a youtube video page.

// ==UserScript==
// @name         YouTube Always 480p
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Always load youtube in 480p Quality
// @author       You
// @match        https://www.youtube.com/*
// @grant        none
// @run-at        document-start
// ==/UserScript==

(function() {
    'use strict';

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