// ==UserScript==
// @name         Reddit: Hide udiomusic posts flared as 'Feedback'
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Hide posts flared as 'Feedback'
// @author       Yo
// @match        *://old.reddit.com/r/udiomusic*
// @run-at       document-end
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function hideFeedbackFlair() {
        document.querySelectorAll('.flairrichtext.flaircolordark.linkflairlabel').forEach(element => {
            if ( element.innerText.includes('Feedback') ) {
                element.parentElement.parentElement.parentElement.parentElement.style.display = 'none';
            }
        });
    }

hideFeedbackFlair();
})();