User:C.Ezra.M/addPrefixesLink.js

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/* You can define these variables:

nsSpecialName - localized name for the Special namespace
specialPrefixIndexName - localized name for "PrefixIndex"
title = the hover title
display = link text
*/

var config = mw.config.values;

if     (config.wgNamespaceNumber != -1) // Exclude special pages
{
    var list = document.querySelector("#p-tb ul");
    var li = document.createElement("li");
    var link = document.createElement("a");

    var href = config.wgArticlePath+"/"+config.wgPageName;
    if (window.nsSpecialName === undefined) {
        window.nsSpecialName = "Special";
    }
    href = href.replace("$1",nsSpecialName.trim()+":$1")
    if (window.specialPrefixIndexName === undefined) {
        window.specialPrefixIndexName = "PrefixIndex";
    }
    href = href.replace("$1",specialPrefixIndexName.trim())
    // Assuming leaving defaults (and wgArticlePath with "/wiki/$1"), the href should be "/wiki/Special:PrefixIndex/<pagename>"
    link.href = href;
    if (window.title === undefined) {
        window.title = "See subpages of this page";
    }
    link.title = title.trim();
    if (window.display === undefined) {
        window.display = "List of subpages";
    }
    link.innerHTML = display.trim();
    li.appendChild(link);
    list.appendChild(li);
}