diff --git a/extension.json b/extension.json
index c556b56bc..478132851 100644
--- a/extension.json
+++ b/extension.json
@@ -72,7 +72,7 @@
 				"CommentItem.js",
 				"HeadingItem.js",
 				"CommentDetails.js",
-				"MemoryStorage.js",
+				"createMemoryStorage.js",
 				"lib/moment-timezone/moment-timezone-with-data-1970-2030.js",
 				{
 					"name": "parser/data.json",
diff --git a/modules/.eslintrc.json b/modules/.eslintrc.json
index fc24b49d7..f5d7568bd 100644
--- a/modules/.eslintrc.json
+++ b/modules/.eslintrc.json
@@ -24,6 +24,7 @@
 				"CommentItem": "CommentItem",
 				"DmMWPingNode": "DmMWPingNode",
 				"HeadingItem": "HeadingItem",
+				"MemoryStorage": "MemoryStorage",
 				"moment": "moment",
 				"ThreadItemSet": "ThreadItemSet",
 				"ThreadItem": "ThreadItem"
diff --git a/modules/MemoryStorage.js b/modules/MemoryStorage.js
deleted file mode 100644
index dbc864f2e..000000000
--- a/modules/MemoryStorage.js
+++ /dev/null
@@ -1,66 +0,0 @@
-/**
- * MemoryStorage creates a wrapper around mw.SafeStorage objects, duplicating
- * their contents in memory, so that even if the underlying storage mechanism
- * fails (e.g. quota exceeded), the storage can be relied on before the
- * page has been reloaded.
- *
- * @example
- * var sessionStorage = new MemoryStorage( mw.storage.session.store );
- * var localStorage = new MemoryStorage( mw.storage.store );
- *
- * @class
- * @extends mw.SafeStorage
- * @param {Object} store
- */
-function MemoryStorage() {
-	this.data = {};
-
-	// Parent constructor
-	MemoryStorage.super.apply( this, arguments );
-}
-
-// HACK: SafeStorage is not exposed as a public API, but we can
-// access it as the constructor of mw.storage.
-var SafeStorage = mw.storage.constructor;
-
-/* Inheritance */
-
-OO.inheritClass( MemoryStorage, SafeStorage );
-
-/* Methods */
-
-/**
- * @inheritdoc
- */
-MemoryStorage.prototype.get = function ( key ) {
-	if ( Object.prototype.hasOwnProperty.call( this.data, key ) ) {
-		return this.data[ key ];
-	} else {
-		// Parent method
-		return MemoryStorage.super.prototype.get.apply( this, arguments );
-	}
-};
-
-/**
- * @inheritdoc
- */
-MemoryStorage.prototype.set = function ( key, value ) {
-	// Parent method
-	MemoryStorage.super.prototype.set.apply( this, arguments );
-
-	this.data[ key ] = value;
-	return true;
-};
-
-/**
- * @inheritdoc
- */
-MemoryStorage.prototype.remove = function ( key ) {
-	// Parent method
-	MemoryStorage.super.prototype.remove.apply( this, arguments );
-
-	delete this.data[ key ];
-	return true;
-};
-
-module.exports = MemoryStorage;
diff --git a/modules/controller.js b/modules/controller.js
index bf0993bde..a94416f43 100644
--- a/modules/controller.js
+++ b/modules/controller.js
@@ -5,8 +5,8 @@ var
 	pageThreads,
 	lastControllerScrollOffset,
 	featuresEnabled = mw.config.get( 'wgDiscussionToolsFeaturesEnabled' ) || {},
-	MemoryStorage = require( './MemoryStorage.js' ),
-	storage = new MemoryStorage( mw.storage.session.store ),
+	createMemoryStorage = require( './createMemoryStorage.js' ),
+	storage = createMemoryStorage( mw.storage.session ),
 	Parser = require( './Parser.js' ),
 	ThreadItemSet = require( './ThreadItemSet.js' ),
 	CommentDetails = require( './CommentDetails.js' ),
diff --git a/modules/createMemoryStorage.js b/modules/createMemoryStorage.js
new file mode 100644
index 000000000..bb5874dee
--- /dev/null
+++ b/modules/createMemoryStorage.js
@@ -0,0 +1,83 @@
+/**
+ * createMemoryStorage creates a wrapper around mw.SafeStorage objects, duplicating
+ * their contents in memory, so that even if the underlying storage mechanism
+ * fails (e.g. quota exceeded), the storage can be relied on before the
+ * page has been reloaded.
+ *
+ * @example
+ * var sessionStorage = createMemoryStorage( mw.storage.session );
+ * var localStorage = createMemoryStorage( mw.storage );
+ *
+ * @param {mw.SafeStorage} storage
+ * @return {MemoryStorage}
+ */
+var createMemoryStorage = function ( storage ) {
+
+	/**
+	 * @class
+	 * @extends mw.SafeStorage
+	 *
+	 * @constructor
+	 * @param {Storage|undefined} store The Storage instance to wrap around
+	 */
+	function MemoryStorage( store ) {
+		this.data = {};
+
+		// Attempt to populate memory cache with existing data.
+		// Ignore any errors accessing native Storage object, as in mw.SafeStorage.
+		try {
+			for ( var i = 0, l = store.length; i < l; i++ ) {
+				var key = store.key( i );
+				this.data[ key ] = store.getItem( key );
+			}
+		} catch ( e ) {}
+
+		// Parent constructor
+		MemoryStorage.super.apply( this, arguments );
+	}
+
+	/* Inheritance */
+
+	var ParentStorage = storage.constructor;
+	OO.inheritClass( MemoryStorage, ParentStorage );
+
+	/* Methods */
+
+	/**
+	 * @inheritdoc
+	 */
+	MemoryStorage.prototype.get = function ( key ) {
+		if ( Object.prototype.hasOwnProperty.call( this.data, key ) ) {
+			return this.data[ key ];
+		} else {
+			// Parent method
+			return MemoryStorage.super.prototype.get.apply( this, arguments );
+		}
+	};
+
+	/**
+	 * @inheritdoc
+	 */
+	MemoryStorage.prototype.set = function ( key, value ) {
+		// Parent method
+		MemoryStorage.super.prototype.set.apply( this, arguments );
+
+		this.data[ key ] = value;
+		return true;
+	};
+
+	/**
+	 * @inheritdoc
+	 */
+	MemoryStorage.prototype.remove = function ( key ) {
+		// Parent method
+		MemoryStorage.super.prototype.remove.apply( this, arguments );
+
+		delete this.data[ key ];
+		return true;
+	};
+
+	return new MemoryStorage( storage.store );
+};
+
+module.exports = createMemoryStorage;
diff --git a/modules/dt.ui.ReplyWidgetVisual.js b/modules/dt.ui.ReplyWidgetVisual.js
index ddba8b5cb..b89008d25 100644
--- a/modules/dt.ui.ReplyWidgetVisual.js
+++ b/modules/dt.ui.ReplyWidgetVisual.js
@@ -115,9 +115,15 @@ ReplyWidgetVisual.prototype.setup = function ( data, suppressNotifications ) {
 			focus: [ 'emit', 'bodyFocus' ]
 		} );
 
+		var listStorage = ve.init.platform.createListStorage( widget.storage );
+		// widget.storage is a MemoryStorage object. Copy over the .data cache so
+		// that listStorage reads from/writes to the same in-memory cache.
+		listStorage.data = widget.storage.data;
+
 		target.initAutosave( {
 			suppressNotifications: suppressNotifications,
-			docId: widget.storagePrefix
+			docId: widget.storagePrefix,
+			storage: listStorage
 		} );
 		widget.afterSetup();