If you install this and all text turns red, then things are working.
// ==UserScript== // @name Greasemonkey/Tampermonkey/Violentmonkey test style // @namespace http://userstyles.org // @description If you install this and all text turns red, then things are working. // @author JasonBarnabe // @homepage http://greasyfork.org/scripts/1 // @run-at document-start // @version 20231121.2 // @include * // ==/UserScript== (function() { var css = "*{ color: #F00 !important; }"; if (typeof GM_addStyle != "undefined") { GM_addStyle(css); } else if (typeof PRO_addStyle != "undefined") { PRO_addStyle(css); } else if (typeof addStyle != "undefined") { addStyle(css); } else { var node = document.createElement("style"); node.type = "text/css"; node.appendChild(document.createTextNode(css)); var heads = document.getElementsByTagName("head"); if (heads.length > 0) { heads[0].appendChild(node); } else { // no head yet, stick it whereever document.documentElement.appendChild(node); } } })();