From 43d39a406f80bae17999d50b0ae992955dfcccf9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Tue, 19 Jan 2021 21:24:32 +0100
Subject: [PATCH] Bug 1572798 - Explicitly check for top contexts because
 devtools creates it.

MANUAL PUSH: Last minute orange on a CLOSED TREE
---
 dom/base/nsFrameLoader.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dom/base/nsFrameLoader.cpp b/dom/base/nsFrameLoader.cpp
index 6ba4b2325574..00a0003cd378 100644
--- a/dom/base/nsFrameLoader.cpp
+++ b/dom/base/nsFrameLoader.cpp
@@ -3816,7 +3816,8 @@ bool nsFrameLoader::EnsureBrowsingContextAttached() {
   rv = mPendingBrowsingContext->SetRemoteSubframes(useRemoteSubframes);
   NS_ENSURE_SUCCESS(rv, false);
 
-  if (isContent && mOwnerContent->IsXULElement() &&
+  if (isContent && mPendingBrowsingContext->IsTop() &&
+      mOwnerContent->IsXULElement() &&
       !mOwnerContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::initiallyactive,
                                   nsGkAtoms::_false, eIgnoreCase)) {
     // Content <browser> elements are active, unless told otherwise by the