Greasemonkey script for deleting read Gmail messages in basic HTML view

gmail-delete.user.js

// ==UserScript==
// @name        GMail Delete Button
// @namespace   http://nkmathew.github.io
// @description Adds a button that deletes all read emails in gmail(when in basic HTML view)
// @require     https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js
// @include     https://mail.google.com/mail/u/0/h/*
// @version     0.1
// @grant       none
// @run-at      document-end
// ==/UserScript==

/**
 * Simply ticks the checkboxes of read messages and clicks the delete button
 */
unreadEmails = $('tr[bgcolor="#E8EEF7"] td input[name="t"]');
$('<input name="nvp_a_tr" value="Delete Read Emails" class="gmail-delete-button" type="submit">').insertAfter($('input[name="nvp_a_tr"]'));
$('.gmail-delete-button').click(function() {
  unreadEmails.prop('checked', true);
})