Index: lib/filterComposer.js
===================================================================
--- a/lib/filterComposer.js
+++ b/lib/filterComposer.js
@@ -172,11 +172,7 @@
     page.contextMenus.create(contextMenuItem);
 }
 
-FilterNotifier.addListener((action, page, filter) =>
-{
-  if (action == "page.WhitelistingStateRevalidate")
-    updateContextMenu(page, filter);
-});
+FilterNotifier.on("page.WhitelistingStateRevalidate", updateContextMenu);
 
 Prefs.on("shouldShowBlockElementMenu", () =>
 {