Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

/* Navigation Popups */
/* Currently Disabled
mw.loader.load('/load.php?modules=ext.gadget.Navigation_popups');
window.popupAdminLinks = false;
window.popupActionsMenu = false;
window.popupStructure = 'lite';
window.popupSubpopups = false;
window.popupSummaryData = false;
*/

$(document).ready(function() {
	var goToDogcraft = document.querySelectorAll("#p-Go_to_Dogcraft > a");
	goToDogcraft[0].setAttribute("href", "//dogcraft.net");
	
	var indicator = document.querySelectorAll(".mw-indicators");
	var indicator1 = indicator[0];
	
	if (indicator1.childNodes.length !== 1) {document.getElementById("tagline").innerHTML = indicator1.innerHTML;}
	
	var mainNamespaceMarker = document.createElement("h4");
	mainNamespaceMarker.classList.add("namespace");
	mainNamespaceMarker.classList.add("label");
	mainNamespaceMarker.textContent = "Main";
	
	var	pageContentDiv = document.getElementById("content"),
		pagePcactions = document.getElementById("p-cactions");
		
	if (mw.config.get('wgNamespaceName') == "Main") 
		{
			pagePcactions.insertBefore(mainNamespaceMarker,pageContentDiv);
		}
	
});

MediaWiki

Common.js