diff --git a/platform/firefox/frameScript.js b/platform/firefox/frameScript.js
index 05e5ceff7..55e0757ce 100644
--- a/platform/firefox/frameScript.js
+++ b/platform/firefox/frameScript.js
@@ -50,6 +50,7 @@
     let shutdown = function(ev) {
         if ( ev.target === this ) {
             this.removeEventListener('unload', shutdown);
+            locationChangeListener = null;
         }
     };
     this.addEventListener('unload', shutdown);