From 0fbf95d36e397304219b73dc445e664212c62994 Mon Sep 17 00:00:00 2001
From: Gijs Kruitbosch <gijskruitbosch@gmail.com>
Date: Thu, 24 Sep 2020 09:53:43 +0000
Subject: [PATCH] Bug 1667031 - URLBarInput's nsIObserver implementation should
 QI its 'subject' argument before using it, r=mak

Differential Revision: https://phabricator.services.mozilla.com/D91249
---
 browser/components/urlbar/UrlbarInput.jsm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/browser/components/urlbar/UrlbarInput.jsm b/browser/components/urlbar/UrlbarInput.jsm
index c089bca11b44..ce5103190bde 100644
--- a/browser/components/urlbar/UrlbarInput.jsm
+++ b/browser/components/urlbar/UrlbarInput.jsm
@@ -1703,6 +1703,7 @@ class UrlbarInput {
   observe(subject, topic, data) {
     switch (topic) {
       case SearchUtils.TOPIC_ENGINE_MODIFIED: {
+        subject.QueryInterface(Ci.nsISearchEngine);
         switch (data) {
           case SearchUtils.MODIFIED_TYPE.CHANGED:
           case SearchUtils.MODIFIED_TYPE.REMOVED: