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diff --git a/www/wiki/extensions/UniversalLanguageSelector/resources/js/ext.uls.preferences.js b/www/wiki/extensions/UniversalLanguageSelector/resources/js/ext.uls.preferences.js
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+++ b/www/wiki/extensions/UniversalLanguageSelector/resources/js/ext.uls.preferences.js
@@ -0,0 +1,158 @@
+/*!
+ * ULS preferences system for MediaWiki.
+ * Localstorage for anonymous users, preferences for logged in users.
+ *
+ * Copyright (C) 2012 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris,
+ * Niklas Laxström, Pau Giner, Santhosh Thottingal, Siebrand Mazeland and other
+ * contributors. See CREDITS for a list.
+ *
+ * UniversalLanguageSelector is dual licensed GPLv2 or later and MIT. You don't
+ * have to do anything special to choose one license or the other and you don't
+ * have to notify anyone which license you are using. You are free to use
+ * UniversalLanguageSelector in commercial projects as long as the copyright
+ * header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
+ *
+ * @file
+ * @ingroup Extensions
+ * @licence GNU General Public Licence 2.0 or later
+ * @licence MIT License
+ */
+
+( function () {
+	'use strict';
+
+	var ULSPreferences;
+
+	/**
+	 * Wrapper for localStorage, falls back to cookie
+	 * when localStorage not supported by browser.
+	 *
+	 * @return {Object}
+	 */
+	function preferenceStore() {
+
+		// If value is detected, set new or modify store
+		return {
+			/*
+			 * Set the value to the given key
+			 * @param {string} key
+			 * @param {Object} value value to be set
+			 */
+			set: function ( key, value ) {
+				// Convert object values to JSON
+				if ( typeof value === 'object' ) {
+					value = JSON.stringify( value );
+				}
+
+				try {
+					localStorage.setItem( key, value );
+				} catch ( e ) {}
+			},
+			/*
+			 * Returns the value of the given key
+			 * @param {string} key
+			 * @return {Object} value of the key
+			 */
+			get: function ( key ) {
+				var data;
+
+				try {
+					data = JSON.parse( localStorage.getItem( key ) );
+				} catch ( e ) {}
+
+				return data;
+			}
+		};
+	}
+
+	ULSPreferences = function () {
+		this.preferenceName = 'uls-preferences';
+		this.username = mw.user.getName();
+		this.isAnon = mw.user.isAnon();
+		this.preferences = null;
+		this.init();
+	};
+
+	ULSPreferences.prototype = {
+		/**
+		 * Initialize
+		 */
+		init: function () {
+			var options;
+
+			if ( this.isAnon ) {
+				this.preferences = preferenceStore().get( this.preferenceName );
+			} else {
+				options = mw.user.options.get( this.preferenceName );
+				if ( !options ) {
+					options = '{}';
+				}
+				// Try to parse JSON
+				try {
+					this.preferences = JSON.parse( options );
+				} catch ( e ) {
+					this.preferences = {};
+				}
+			}
+
+			this.preferences = this.preferences || {};
+		},
+
+		/**
+		 * Set the preference
+		 *
+		 * @param {string} key
+		 * @param {mixed} value
+		 */
+		set: function ( key, value ) {
+			this.preferences[ key ] = value;
+		},
+
+		/**
+		 * Get a preference value for the given preference name
+		 *
+		 * @param {string} key
+		 * @return {Mixed}
+		 */
+		get: function ( key ) {
+			return this.preferences[ key ];
+		},
+
+		/**
+		 * Save the preferences
+		 *
+		 * @param {Function} callback
+		 */
+		save: function ( callback ) {
+			var ulsPreferences = this;
+
+			callback = callback || function () {};
+			if ( this.isAnon ) {
+				// Anonymous user. Save preferences in local storage
+				preferenceStore().set( this.preferenceName, this.preferences );
+				callback.call( this, true );
+			} else {
+				// Logged in user. Use MW APIs to change preferences
+				new mw.Api().saveOption(
+					ulsPreferences.preferenceName,
+					JSON.stringify( ulsPreferences.preferences )
+				).done( function () {
+					callback.call( this, true );
+				} ).fail( function () {
+					callback.call( this, false );
+				} );
+			}
+		}
+	};
+
+	mw.uls = mw.uls || {};
+	mw.uls.preferences = function () {
+		var data = $( 'body' ).data( 'preferences' );
+
+		if ( !data ) {
+			$( 'body' ).data( 'preferences', ( data = new ULSPreferences() ) );
+		}
+		return data;
+	};
+
+}() );