diff --git a/src/wp-admin/js/customize-controls.js b/src/wp-admin/js/customize-controls.js
index a93d4fbee8..ede6a867ea 100644
--- a/src/wp-admin/js/customize-controls.js
+++ b/src/wp-admin/js/customize-controls.js
@@ -913,7 +913,7 @@
 		if ( ! $.support.postMessage || ( ! $.support.cors && api.settings.isCrossDomain ) )
 			return window.location = api.settings.url.fallback;
 
-		var previewer, parent, topFocus,
+		var parent, topFocus,
 			body = $( document.body ),
 			overlay = body.children( '.wp-full-overlay' ),
 			title = $( '#customize-info .theme-name.site-title' ),
@@ -931,7 +931,7 @@
 		});
 
 		// Initialize Previewer
-		previewer = new api.Previewer({
+		api.previewer = new api.Previewer({
 			container:   '#customize-preview',
 			form:        '#customize-controls',
 			previewUrl:  api.settings.url.preview,
@@ -1008,14 +1008,14 @@
 		});
 
 		// Refresh the nonces if the preview sends updated nonces over.
-		previewer.bind( 'nonce', function( nonce ) {
+		api.previewer.bind( 'nonce', function( nonce ) {
 			$.extend( this.nonce, nonce );
 		});
 
 		$.each( api.settings.settings, function( id, data ) {
 			api.create( id, id, data.value, {
 				transport: data.transport,
-				previewer: previewer
+				previewer: api.previewer
 			} );
 		});
 
@@ -1025,15 +1025,16 @@
 
 			control = api.control.add( id, new constructor( id, {
 				params: data,
-				previewer: previewer
+				previewer: api.previewer
 			} ) );
 		});
 
 		// Check if preview url is valid and load the preview frame.
-		if ( previewer.previewUrl() )
-			previewer.refresh();
-		else
-			previewer.previewUrl( api.settings.url.home );
+		if ( api.previewer.previewUrl() ) {
+			api.previewer.refresh();
+		} else {
+			api.previewer.previewUrl( api.settings.url.home );
+		}
 
 		// Save and activated states
 		(function() {
@@ -1082,13 +1083,13 @@
 
 		// Button bindings.
 		saveBtn.click( function( event ) {
-			previewer.save();
+			api.previewer.save();
 			event.preventDefault();
 		}).keydown( function( event ) {
 			if ( 9 === event.which ) // tab
 				return;
 			if ( 13 === event.which ) // enter
-				previewer.save();
+				api.previewer.save();
 			event.preventDefault();
 		});
 
diff --git a/src/wp-admin/js/customize-widgets.js b/src/wp-admin/js/customize-widgets.js
index 47505dd34c..3ba7df8919 100644
--- a/src/wp-admin/js/customize-widgets.js
+++ b/src/wp-admin/js/customize-widgets.js
@@ -5,7 +5,7 @@
 
 	// Set up our namespace...
 	var api = wp.customize,
-		l10n, OldPreviewer;
+		l10n;
 
 	api.Widgets = api.Widgets || {};
 
@@ -185,7 +185,7 @@
 			} );
 
 			// Close the panel if the URL in the preview changes
-			api.Widgets.Previewer.bind( 'url', this.close );
+			api.previewer.bind( 'url', this.close );
 		},
 
 		// Performs a search and handles selected widget
@@ -745,14 +745,14 @@
 				self.container.removeClass( 'previewer-loading' );
 			} );
 
-			api.Widgets.Previewer.bind( 'widget-updated', function( updatedWidgetId ) {
+			api.previewer.bind( 'widget-updated', function( updatedWidgetId ) {
 				if ( updatedWidgetId === self.params.widget_id ) {
 					self.container.removeClass( 'previewer-loading' );
 				}
 			} );
 
 			// Update widget control to indicate whether it is currently rendered
-			api.Widgets.Previewer.bind( 'rendered-widgets', function( renderedWidgets ) {
+			api.previewer.bind( 'rendered-widgets', function( renderedWidgets ) {
 				var isRendered = !! renderedWidgets[self.params.widget_id];
 
 				self.container.toggleClass( 'widget-rendered', isRendered );
@@ -971,17 +971,17 @@
 
 				// Check if the user is logged out.
 				if ( '0' === r ) {
-					api.Widgets.Previewer.preview.iframe.hide();
-					api.Widgets.Previewer.login().done( function() {
+					api.previewer.preview.iframe.hide();
+					api.previewer.login().done( function() {
 						self.updateWidget( args );
-						api.Widgets.Previewer.preview.iframe.show();
+						api.previewer.preview.iframe.show();
 					} );
 					return;
 				}
 
 				// Check for cheaters.
 				if ( '-1' === r ) {
-					api.Widgets.Previewer.cheatin();
+					api.previewer.cheatin();
 					return;
 				}
 
@@ -1418,7 +1418,7 @@
 			} );
 
 			// Update the model with whether or not the sidebar is rendered
-			api.Widgets.Previewer.bind( 'rendered-sidebars', function( renderedSidebars ) {
+			api.previewer.bind( 'rendered-sidebars', function( renderedSidebars ) {
 				var isRendered = !! renderedSidebars[self.params.sidebar_id];
 
 				registeredSidebar.set( 'is_rendered', isRendered );
@@ -1738,18 +1738,6 @@
 		sidebar_widgets: api.Widgets.SidebarControl
 	});
 
-	/**
-	 * Capture the instance of the Previewer since it is private
-	 */
-	OldPreviewer = api.Previewer;
-	api.Previewer = OldPreviewer.extend({
-		initialize: function( params, options ) {
-			api.Widgets.Previewer = this;
-			OldPreviewer.prototype.initialize.call( this, params, options );
-			this.bind( 'refresh', this.refresh );
-		}
-	} );
-
 	/**
 	 * Init Customizer for widgets.
 	 */
@@ -1760,10 +1748,10 @@
 		});
 
 		// Highlight widget control
-		api.Widgets.Previewer.bind( 'highlight-widget-control', api.Widgets.highlightWidgetFormControl );
+		api.previewer.bind( 'highlight-widget-control', api.Widgets.highlightWidgetFormControl );
 
 		// Open and focus widget control
-		api.Widgets.Previewer.bind( 'focus-widget-control', api.Widgets.focusWidgetFormControl );
+		api.previewer.bind( 'focus-widget-control', api.Widgets.focusWidgetFormControl );
 	} );
 
 	/**