--- a/toolkit/components/extensions/ext-webRequest.js
+++ b/toolkit/components/extensions/ext-webRequest.js
@@ -6,16 +6,17 @@ XPCOMUtils.defineLazyModuleGetter(this, 
                                   "resource://gre/modules/MatchPattern.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "WebRequest",
                                   "resource://gre/modules/WebRequest.jsm");
 
 Cu.import("resource://gre/modules/ExtensionUtils.jsm");
 var {
   SingletonEventManager,
   runSafeSync,
+  ignoreEvent,
 } = ExtensionUtils;
 
 // EventManager-like class specifically for WebRequest. Inherits from
 // SingletonEventManager. Takes care of converting |details| parameter
 // when invoking listeners.
 function WebRequestEventManager(context, eventName)
 {
   let name = `webRequest.${eventName}`;
@@ -121,11 +122,15 @@ extensions.registerPrivilegedAPI("webReq
       onBeforeSendHeaders: new WebRequestEventManager(context, "onBeforeSendHeaders").api(),
       onSendHeaders: new WebRequestEventManager(context, "onSendHeaders").api(),
       onHeadersReceived: new WebRequestEventManager(context, "onHeadersReceived").api(),
       onResponseStarted: new WebRequestEventManager(context, "onResponseStarted").api(),
       onCompleted: new WebRequestEventManager(context, "onCompleted").api(),
       handlerBehaviorChanged: function() {
         // TODO: Flush all caches.
       },
+
+      // TODO
+      onBeforeRedirect: ignoreEvent(context, "webRequest.onBeforeRedirect"),
+      onErrorOccurred: ignoreEvent(context, "webRequest.onErrorOccurred"),
     },
   };
 });