From a176a0e5f2a347de47958a1fb1fe2538a7e50ccc Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Fri, 3 Jan 2020 22:20:36 -0500
Subject: [PATCH] Bug 1351979 - Change CustomElementRegistry::Define code to
 properly propagate out JS exceptions;

Tag UXP Issue #1344
---
 dom/base/CustomElementRegistry.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dom/base/CustomElementRegistry.cpp b/dom/base/CustomElementRegistry.cpp
index 1ab566e1de..d8ca7ade20 100644
--- a/dom/base/CustomElementRegistry.cpp
+++ b/dom/base/CustomElementRegistry.cpp
@@ -745,7 +745,7 @@ CustomElementRegistry::Define(const nsAString& aName,
       //       here.
       JS::RootedValue rootedv(cx, JS::ObjectValue(*constructorProtoUnwrapped));
       if (!JS_WrapValue(cx, &rootedv) || !callbacksHolder->Init(cx, rootedv)) {
-        aRv.Throw(NS_ERROR_FAILURE);
+        aRv.StealExceptionFromJSContext(cx);
         return;
       }
     } // Leave constructorProtoUnwrapped's compartment.