Board Thread:Support Requests - Getting Technical/@comment-24567267-20131203020041/@comment-4519283-20131203022228

var rollbacks=["User1","User2","Etc"]; // Make sure you capitalize each name if (wgPageName == 'Special:Chat') {  for(var i=0;i<rollbacks.length;i++) {     if(document.getElementById("user-"+rollbacks[i]) !== null) // Prevent errors if user isn't on chat {        document.getElementById("user-"+rollbacks[i]).className += " chat-mod"; }  } }

Put this in Mediawiki:Global.js on your wiki. The script may take some time to show up (Wikia's servers are lazy and decide that nothing has changed, so why bother calculating everything again), and make sure you put the names on the first line with the first letter capitalized.