hide kudos button if you've already left kudos
// ==UserScript==
// @name ao3 no rekudos
// @version 0.1
// @description hide kudos button if you've already left kudos
// @include /https?://archiveofourown\.org/.*works/\d+/
// @grant none
// @namespace https://greasyfork.org/users/36620
// ==/UserScript==
var greeting, username, kudos, btn;
greeting = document.getElementById('greeting');
username = greeting.querySelector('a').href;
username = username.slice(username.lastIndexOf('/')+1);
kudos = document.getElementById('feedback');
kudos = kudos.querySelectorAll('.kudos a');
btn = document.getElementById('new_kudo');
for (var i = 0; i < kudos.length; i++) {
if (kudos[i].innerText == username) {
btn.style.display = "none";
break;
}
}