Thread:LightHouse38/@comment-34888194-20190411014843

As TheKorraFanatic mentioned, it is possible that your JS is not enabled in the preferences.

I've also realized that I only gave you portion of the script, so this one should work:

mw.loader.using('mediawiki.api', function {	//Exit if normal rollback links are present	if ($('.mw-rollback-link').length) return;	var conf = mw.config.get([ 'wgAction', 'wgCanonicalSpecialPageName', 'wgContentLanguage', 'wgPageName', 'wgUserLanguage', 'skin' ]),	i18n = {		en: {			rollback: "rollback",			description: ""Rollback" reverts edit(s) to this page of the last contributor in one click",			summary: "Reverted edits by $1 (talk | block) to last version by $2 (script)",			summaryShort: "Reverted edits by $1 (talk) to last version by $2 (script)",			editConflict: "Unable to rollback (edit conflict)",			contentFail: "Unable to rollback (failed to get page content)",			singleEditor: "Unable to rollback (no different editor found)",			revisionFail: "Unable to rollback (failed to get revisions)",			editFail: "Unable to rollback (failed to publish edit)",			success: "Rollback successful"		}	};	i18n = i18n[conf.wgUserLanguage] || i18n[conf.wgUserLanguage.split('-')[0]] || i18n[conf.wgContentLanguage] || i18n[conf.wgContentLanguage.split('-')[0]] || i18n.en; conf.API = new mw.Api; conf.token = mw.user.tokens.values.editToken; //History if (conf.wgAction == "history" && $('#pagehistory li').length > 1) $('#pagehistory li:first .mw-history-undo a').before(' ' + i18n.rollback + ' | '); //Contributions else if (conf.wgCanonicalSpecialPageName == "Contributions") { $('#mw-content-text ul').find('li').each(function {			if ($(this).find('.mw-uctop').length)				$(this).append(' [' + i18n.rollback + '] ');		}); }	//Diffs else if (($.getUrlVar('diff') || $.getUrlVar('oldid')) && $('#differences-nextlink').length === 0) $('.mw-usertoollinks:last').after('     [' + i18n.rollback + '] '); else return; mw.util.addCSS('.mw-custom-rollback-link a { cursor: pointer; }'); $('.mw-custom-rollback-link a').click(function {		getRevisionIdAndContent($(this).data('id'),$(this).data('user').replace(/_/g, " "));		$(this).parent.remove;	}); function getRevisionIdAndContent(title,target) { conf.API.get({		action: 'query',		prop: 'revisions',		titles: title,		rvprop: 'user|ids',		rvlimit: 500,		cb: new Date.getTime		}) .done(function(d) {			if (!d.error) {				var revisions;				for (var i in d.query.pages) {					revisions = d.query.pages[i].revisions;				}				var lastUser,				revId;				for (var j in revisions) {					if (revisions[j].user != target) {						lastUser = revisions[j].user; //remember last author						revId = revisions[j].revid; //get revision to revert to						break;					}				}				if (lastUser) {					conf.API.get({ action: 'query', prop: 'revisions', rvprop: 'content', revids: revId, cb: new Date.getTime })					.done(function(d) { if (!d.error) { var content = ""; //can be no content on page for (var i in d.query.pages) { if (d.query.pages[i].revisions) content = d.query.pages[i].revisions[0]["*"]; }							performRollback(title,content,target,lastUser); }						else outputError(i18n.contentFail + ': ' + d.error.code); })					.fail(function { outputError(i18n.contentFail); });				}				else					outputError(i18n.singleEditor);			}			else				outputError(i18n.revisionFail + ': ' + d.error.code);		}) .fail(function {			outputError(i18n.revisionFail);		}); }	function performRollback(page,text,user,user2) { var summary = i18n.summary.replace(/\$1/g,user).replace(/\$2/g,user2); conf.API.post({		action: 'edit',		title: page,		text: text,		summary: summary,		minor: true,		token: conf.token		}) .done(function(d) {			if (!d.error) {				new BannerNotification(i18n.success,'confirm').show;							}			else				outputError(i18n.editFail + ': ' + d.error.code);		}) .fail(function {			outputError(i18n.editFail);		}); }	function outputError(text) { switch (conf.skin) { case 'oasis': case 'wikia': new BannerNotification(text,'error').show; break; default: alert(text); break; }		} });  