Index: lib/filterClasses.js
===================================================================
--- a/lib/filterClasses.js
+++ b/lib/filterClasses.js
@@ -16,17 +16,17 @@
  */
 
 "use strict";
 
 /**
  * @fileOverview Definition of Filter class and its subclasses.
  */
 
-const {FilterNotifier} = require("./filterNotifier");
+const {filterNotifier} = require("./filterNotifier");
 const {extend} = require("./coreUtils");
 const {filterToRegExp} = require("./common");
 
 /**
  * All known unique domain sources mapped to their parsed values.
  * @type {Map.<string,Map.<string,boolean>>}
  */
 let knownDomainMaps = new Map();
@@ -314,17 +314,17 @@
     return this._disabled;
   },
   set disabled(value)
   {
     if (value != this._disabled)
     {
       let oldValue = this._disabled;
       this._disabled = value;
-      FilterNotifier.emit("filter.disabled", this, value, oldValue);
+      filterNotifier.emit("filter.disabled", this, value, oldValue);
     }
     return this._disabled;
   },
 
   /**
    * Number of hits on the filter since the last reset
    * @type {number}
    */
@@ -333,17 +333,17 @@
     return this._hitCount;
   },
   set hitCount(value)
   {
     if (value != this._hitCount)
     {
       let oldValue = this._hitCount;
       this._hitCount = value;
-      FilterNotifier.emit("filter.hitCount", this, value, oldValue);
+      filterNotifier.emit("filter.hitCount", this, value, oldValue);
     }
     return this._hitCount;
   },
 
   /**
    * Last time the filter had a hit (in milliseconds since the beginning of the
    * epoch)
    * @type {number}
@@ -353,17 +353,17 @@
     return this._lastHit;
   },
   set lastHit(value)
   {
     if (value != this._lastHit)
     {
       let oldValue = this._lastHit;
       this._lastHit = value;
-      FilterNotifier.emit("filter.lastHit", this, value, oldValue);
+      filterNotifier.emit("filter.lastHit", this, value, oldValue);
     }
     return this._lastHit;
   },
 
   /**
    * String that the domains property should be generated from
    * @type {?string}
    */