Disable keyboard shortcuts.user.js

// ==UserScript==
// @name           Disable keyboard shortcuts
// @description    Stop websites from highjacking keyboard shortcuts
//
// @run-at         document-start
// @include        https://github.com/*
// @grant          none
// ==/UserScript==

keycodes = [84] // Keycode for 'T', add more keycodes to disable other key captures

document.addEventListener('keydown', function(e) {
//    alert(e.keyCode); //uncomment to find out the keycode for any given key
    if (keycodes.indexOf(e.keyCode) != -1)
    {
        e.cancelBubble = true;
        e.stopImmediatePropagation();
    }
    return false;
});