Index: lib/synchronizer.js
===================================================================
--- a/lib/synchronizer.js
+++ b/lib/synchronizer.js
@@ -90,17 +90,17 @@
    * downloaded.
    * @yields {Downloadable}
    */
   *_getDownloadables()
   {
     if (!Prefs.subscriptions_autoupdate)
       return;
 
-    for (let subscription of FilterStorage.subscriptions)
+    for (let subscription of FilterStorage.subscriptions())
     {
       if (subscription instanceof DownloadableSubscription)
         yield this._getDownloadable(subscription, false);
     }
   }
 
   /**
    * Creates a {@link Downloadable} instance for a subscription.