checkbox-dynamic-change.xhtml

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<?xml version="1.0"?>

<?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>

<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" class="reftest-wait">

  <checkbox id="c1" checked="true"/>

  <checkbox id="c2"/>

  <script>

    window.requestAnimationFrame(() => {

      window.requestAnimationFrame(() => {

        let c1 = document.getElementById("c1");

        let c2 = document.getElementById("c2");

        c1.removeAttribute("checked");

        c2.setAttribute("checked", true);

        document.documentElement.className = "";

});

});

  </script>

</window>