Issue 6745 - Prefer strict equality operator

lib/filterNotifier.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 30 matching lines @@
 exports.FilterNotifier = Object.create(new EventEmitter(), desc({
   /**
    * Adds a listener
    *
    * @deprecated use FilterNotifier.on(action, callback)
    * @param {FilterNotifierCatchAllListener} listener
    */
   addListener(listener)
   {
     let listeners = this._listeners.get(CATCH_ALL);
-    if (!listeners || listeners.indexOf(listener) == -1)
+    if (!listeners || listeners.indexOf(listener) === -1)
       this.on(CATCH_ALL, listener);
   },
 
   /**
    * Removes a listener that was previosly added via addListener
    *
    * @deprecated use FilterNotifier.off(action, callback)
    * @param {FilterNotifierCatchAllListener} listener
    */
   removeListener(listener)
@@ skipping 15 matching lines @@
    * @param {*} param2
    * @param {*} param3
    * @deprecated use FilterNotifier.emit(action)
    */
   triggerListeners(action, item, param1, param2, param3)
   {
     this.emit(action, item, param1, param2, param3);
     this.emit(CATCH_ALL, action, item, param1, param2, param3);
   }
 }));