diff --git a/dom/base/nsFrameLoader.cpp b/dom/base/nsFrameLoader.cpp
index 625720533a26..1f88af430901 100644
--- a/dom/base/nsFrameLoader.cpp
+++ b/dom/base/nsFrameLoader.cpp
@@ -2111,10 +2111,7 @@ nsFrameLoader::MaybeCreateDocShell()
     PrincipalOriginAttributes poa = BasePrincipal::Cast(doc->NodePrincipal())->OriginAttributesRef();
 
     // Assert on the firstPartyDomain from top-level docshell should be empty
-    if (mIsTopLevelContent) {
-      MOZ_ASSERT(attrs.mFirstPartyDomain.IsEmpty(),
-                 "top-level docshell shouldn't have firstPartyDomain attribute.");
-    }
+    MOZ_ASSERT_IF(mIsTopLevelContent, attrs.mFirstPartyDomain.IsEmpty());
 
     // So far we want to make sure InheritFromDocToChildDocShell doesn't override
     // any other origin attribute than firstPartyDomain.
diff --git a/netwerk/protocol/http/HttpBaseChannel.cpp b/netwerk/protocol/http/HttpBaseChannel.cpp
index b8812c8d02e9..2c5b3c77497b 100644
--- a/netwerk/protocol/http/HttpBaseChannel.cpp
+++ b/netwerk/protocol/http/HttpBaseChannel.cpp
@@ -2937,31 +2937,30 @@ HttpBaseChannel::SetupReplacementChannel(nsIURI       *newURI,
     bool isTopLevelDoc =
       newLoadInfo->GetExternalContentPolicyType() == nsIContentPolicy::TYPE_DOCUMENT;
 
-    if (isTopLevelDoc) {
-      nsCOMPtr<nsILoadContext> loadContext;
-      NS_QueryNotificationCallbacks(this, loadContext);
-      DocShellOriginAttributes docShellAttrs;
-      if (loadContext) {
-        loadContext->GetOriginAttributes(docShellAttrs);
-      }
-      MOZ_ASSERT(docShellAttrs.mFirstPartyDomain.IsEmpty(),
-                 "top-level docshell shouldn't have firstPartyDomain attribute.");
-
-      NeckoOriginAttributes attrs = newLoadInfo->GetOriginAttributes();
-
-      MOZ_ASSERT(docShellAttrs.mAppId == attrs.mAppId,
-                "docshell and necko should have the same appId attribute.");
-      MOZ_ASSERT(docShellAttrs.mUserContextId == attrs.mUserContextId,
-                "docshell and necko should have the same userContextId attribute.");
-      MOZ_ASSERT(docShellAttrs.mInIsolatedMozBrowser == attrs.mInIsolatedMozBrowser,
-                "docshell and necko should have the same inIsolatedMozBrowser attribute.");
-      MOZ_ASSERT(docShellAttrs.mPrivateBrowsingId == attrs.mPrivateBrowsingId,
-                 "docshell and necko should have the same privateBrowsingId attribute.");
-
-      attrs.InheritFromDocShellToNecko(docShellAttrs, true, newURI);
-      newLoadInfo->SetOriginAttributes(attrs);
+    nsCOMPtr<nsILoadContext> loadContext;
+    NS_QueryNotificationCallbacks(this, loadContext);
+    DocShellOriginAttributes docShellAttrs;
+    if (loadContext) {
+      loadContext->GetOriginAttributes(docShellAttrs);
     }
 
+    // top-level docshell shouldn't have firstPartyDomain attribute.
+    MOZ_ASSERT_IF(isTopLevelDoc, docShellAttrs.mFirstPartyDomain.IsEmpty());
+
+    NeckoOriginAttributes attrs = newLoadInfo->GetOriginAttributes();
+
+    MOZ_ASSERT(docShellAttrs.mAppId == attrs.mAppId,
+               "docshell and necko should have the same appId attribute.");
+    MOZ_ASSERT(docShellAttrs.mUserContextId == attrs.mUserContextId,
+               "docshell and necko should have the same userContextId attribute.");
+    MOZ_ASSERT(docShellAttrs.mInIsolatedMozBrowser == attrs.mInIsolatedMozBrowser,
+               "docshell and necko should have the same inIsolatedMozBrowser attribute.");
+    MOZ_ASSERT(docShellAttrs.mPrivateBrowsingId == attrs.mPrivateBrowsingId,
+               "docshell and necko should have the same privateBrowsingId attribute.");
+
+    attrs.InheritFromDocShellToNecko(docShellAttrs, isTopLevelDoc, newURI);
+    newLoadInfo->SetOriginAttributes(attrs);
+
     bool isInternalRedirect =
       (redirectFlags & (nsIChannelEventSink::REDIRECT_INTERNAL |
                         nsIChannelEventSink::REDIRECT_STS_UPGRADE));