Wikipedia:WikiProject User scripts/Scripts/External editor

addOnloadHook(function() {
    var editTab = document.getElementById("ca-edit");
    if (!editTab) return;
    var editURL = editTab.getElementsByTagName("a")[0].href;
    addPortletLink("p-cactions", editURL + "&externaledit=true", "EE", "ca-exted", "External editor", "");
});