Index: lib/synchronizer.js
===================================================================
--- a/lib/synchronizer.js
+++ b/lib/synchronizer.js
@@ -21,17 +21,17 @@
  * @fileOverview Manages synchronization of filter subscriptions.
  */
 
 const {Downloader, Downloadable,
        MILLIS_IN_SECOND, MILLIS_IN_MINUTE,
        MILLIS_IN_HOUR, MILLIS_IN_DAY} = require("./downloader");
 const {Filter} = require("./filterClasses");
 const {FilterStorage} = require("./filterStorage");
-const {FilterNotifier} = require("./filterNotifier");
+const {filterNotifier} = require("./filterNotifier");
 const {Prefs} = require("prefs");
 const {Subscription,
        DownloadableSubscription} = require("./subscriptionClasses");
 
 const INITIAL_DELAY = 1 * MILLIS_IN_MINUTE;
 const CHECK_INTERVAL = 1 * MILLIS_IN_HOUR;
 const DEFAULT_EXPIRATION_INTERVAL = 5 * MILLIS_IN_DAY;
 
@@ -136,17 +136,17 @@
     subscription.expires = Math.round(
       downloadable.hardExpiration / MILLIS_IN_SECOND
     );
   },
 
   _onDownloadStarted(downloadable)
   {
     let subscription = Subscription.fromURL(downloadable.url);
-    FilterNotifier.emit("subscription.downloading", subscription);
+    filterNotifier.emit("subscription.downloading", subscription);
   },
 
   _onDownloadSuccess(downloadable, responseText, errorCallback,
                      redirectCallback)
   {
     let lines = responseText.split(/[\r\n]+/);
     let headerMatch = /\[Adblock(?:\s*Plus\s*([\d.]+)?)?\]/i.exec(lines[0]);
     if (!headerMatch)