more-sauce.user.js

// ==UserScript==
// @name        파파존스 무조건 소스많이
// @namespace   https://github.com/scarf005
// @description 무조건 소스많이!!!!!!
// @author      scarf
// @version     1.0.0
// @icon        https://www.google.com/s2/favicons?sz=64&domain=github.com
//
// @homepageURL https://gist.github.com/scarf005/fa439569d0d146fb4c25b9a388429d1e
// @supportURL  https://gist.github.com/scarf005/fa439569d0d146fb4c25b9a388429d1e
// @downloadURL https://gist.github.com/scarf005/fa439569d0d146fb4c25b9a388429d1e/more-sauce.user.js
//
// @match       https://pji.co.kr/menu/productPizzaDetail*
// @grant       GM.addStyle
// ==/UserScript==

{
    GM.addStyle(`button.btn_payment[disabled] { background-color: gray; }`)

    const paymentButton = document.querySelector("button.btn_payment")

    const check = (event) =>
        paymentButton.disabled = event?.target?.getAttribute("data-text") !== "소스 많이"

    document.querySelector("#detail_option2 ul").addEventListener("change", check)
    check()
}