--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -2702,16 +2702,17 @@ nsCSSFrameConstructor::ConstructDocEleme
 
   return newFrame;
 }
 
 
 nsIFrame*
 nsCSSFrameConstructor::ConstructRootFrame()
 {
+  AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ConstructRootFrame", LAYOUT);
   AUTO_PROFILER_TRACING("Frame Construction", "ConstructRootFrame");
   AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
 
   ServoStyleSet* styleSet = mPresShell->StyleSet();
 
   // --------- BUILD VIEWPORT -----------
   RefPtr<ComputedStyle> viewportPseudoStyle =
     styleSet->ResolveInheritingAnonymousBoxStyle(nsCSSAnonBoxes::viewport,
@@ -7084,16 +7085,17 @@ nsCSSFrameConstructor::FindNextSiblingFo
 
 void
 nsCSSFrameConstructor::ContentAppended(nsIContent* aFirstNewContent,
                                        InsertionKind aInsertionKind)
 {
   MOZ_ASSERT(aInsertionKind == InsertionKind::Sync ||
              !RestyleManager()->IsInStyleRefresh());
 
+  AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentAppended", LAYOUT);
   AUTO_PROFILER_TRACING("Frame Construction", "ContentAppended");
   AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
 
 #ifdef DEBUG
   if (gNoisyContentUpdates) {
     printf("nsCSSFrameConstructor::ContentAppended container=%p "
            "first-child=%p lazy=%d\n",
            aFirstNewContent->GetParent(),
@@ -7430,16 +7432,17 @@ void
 nsCSSFrameConstructor::ContentRangeInserted(nsIContent* aStartChild,
                                             nsIContent* aEndChild,
                                             nsILayoutHistoryState* aFrameState,
                                             InsertionKind aInsertionKind)
 {
   MOZ_ASSERT(aInsertionKind == InsertionKind::Sync ||
              !RestyleManager()->IsInStyleRefresh());
 
+  AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentRangeInserted", LAYOUT);
   AUTO_PROFILER_TRACING("Frame Construction", "ContentRangeInserted");
   AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
 
   MOZ_ASSERT(aStartChild, "must always pass a child");
 
 #ifdef DEBUG
   if (gNoisyContentUpdates) {
     printf("nsCSSFrameConstructor::ContentRangeInserted container=%p "
@@ -7892,16 +7895,17 @@ nsCSSFrameConstructor::ContentRangeInser
 bool
 nsCSSFrameConstructor::ContentRemoved(nsIContent* aChild,
                                       nsIContent* aOldNextSibling,
                                       RemoveFlags aFlags)
 {
   MOZ_ASSERT(aChild);
   MOZ_ASSERT(!aChild->IsRootOfAnonymousSubtree() || !aOldNextSibling,
              "Anonymous roots don't have siblings");
+  AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentRemoved", LAYOUT);
   AUTO_PROFILER_TRACING("Frame Construction", "ContentRemoved");
   AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
   nsPresContext* presContext = mPresShell->GetPresContext();
   MOZ_ASSERT(presContext, "Our presShell should have a valid presContext");
 
   // We want to detect when the viewport override element stored in the
   // prescontext is in the subtree being removed.  Except in fullscreen cases
   // (which are handled in Element::UnbindFromTree and do not get stored on the
@@ -8290,16 +8294,17 @@ nsCSSFrameConstructor::EnsureFrameForTex
     root, nsRestyleHint(0), nsChangeHint_ReconstructFrame);
   return true;
 }
 
 void
 nsCSSFrameConstructor::CharacterDataChanged(nsIContent* aContent,
                                             const CharacterDataChangeInfo& aInfo)
 {
+  AUTO_PROFILER_LABEL("nsCSSFrameConstructor::CharacterDataChanged", LAYOUT);
   AUTO_PROFILER_TRACING("Frame Construction", "CharacterDataChanged");
   AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
 
   if ((aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) &&
        !aContent->TextIsOnlyWhitespace()) ||
       (aContent->HasFlag(NS_REFRAME_IF_WHITESPACE) &&
        aContent->TextIsOnlyWhitespace())) {
 #ifdef DEBUG