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E-mail reply highlighting (automatic)

Highlights e-mail replies with different colours per quotation level in lines preceded by ">", ">>" etc.

// ==UserScript==
// @name         E-mail reply highlighting (automatic)
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Highlights e-mail replies with different colours per quotation level in lines preceded by ">", ">>" etc.
// @author       Alexander Kriegisch
// @include      https://*mail.all-inkl.com/*
// @include      https://*.web.de/mail/client/mailbody/*
// @include      https://mail.google.com/mail/*
// @grant        GM_addStyle
// @grant        GM_getValue
// @require      https://cdnjs.cloudflare.com/ajax/libs/mark.js/8.11.1/mark.min.js
// @require      https://greasyfork.org/scripts/5392-waitforkeyelements/code/WaitForKeyElements.js?version=115012
// @require      https://code.jquery.com/jquery-1.12.4.min.js
// @require      https://greasyfork.org/scripts/40782-library-for-e-mail-forward-highlighting/code/Library%20for%20e-mail%20forward%20highlighting.js?version=265774
// ==/UserScript==

(function() {
    'use strict';
    highlightQuotes();
    // Dynamic updates for Gmail AJAX-based reader (heuristic, should be improved)
    waitForKeyElements ("pre", highlightQuotes);
    waitForKeyElements ("div.ii.gt", highlightQuotes);
})();