--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -7217,18 +7217,18 @@ nsCSSFrameConstructor::CheckBitsForLazyF
 //
 // But we disable lazy frame construction for shadow trees... We should fix
 // that, too.
 bool
 nsCSSFrameConstructor::MaybeConstructLazily(Operation aOperation,
                                             nsIContent* aContainer,
                                             nsIContent* aChild)
 {
-  if (mPresShell->GetPresContext()->IsChrome() || !aContainer ||
-      aContainer->IsInNativeAnonymousSubtree() || aContainer->IsXULElement()) {
+  if (!aContainer || aContainer->IsInNativeAnonymousSubtree() ||
+      aContainer->IsXULElement()) {
     return false;
   }
 
   if (aOperation == CONTENTINSERT) {
     if (aChild->IsRootOfAnonymousSubtree() || aChild->IsXULElement()) {
       return false;
     }
   } else { // CONTENTAPPEND