--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -11696,19 +11696,22 @@ static bool IsFirstLetterContent(nsICont
  * Create a letter frame, only make it a floating frame.
  */
 nsFirstLetterFrame*
 nsCSSFrameConstructor::CreateFloatingLetterFrame(
   nsFrameConstructorState& aState,
   nsIContent* aTextContent,
   nsIFrame* aTextFrame,
   nsContainerFrame* aParentFrame,
+  nsStyleContext* aParentStyleContext,
   nsStyleContext* aStyleContext,
   nsFrameItems& aResult)
 {
+  MOZ_ASSERT(aParentStyleContext);
+
   nsFirstLetterFrame* letterFrame =
     NS_NewFirstLetterFrame(mPresShell, aStyleContext);
   // We don't want to use a text content for a non-text frame (because we want
   // its primary frame to be a text frame).  So use its parent for the
   // first-letter.
   nsIContent* letterContent = aTextContent->GetParent();
   nsContainerFrame* containingBlock = aState.GetGeometricParent(
     aStyleContext->StyleDisplay(), aParentFrame);
@@ -11730,23 +11733,19 @@ nsCSSFrameConstructor::CreateFloatingLet
   // See if we will need to continue the text frame (does it contain
   // more than just the first-letter text or not?) If it does, then we
   // create (in advance) a continuation frame for it.
   nsIFrame* nextTextFrame = nullptr;
   if (NeedFirstLetterContinuation(aTextContent)) {
     // Create continuation
     nextTextFrame =
       CreateContinuingFrame(aState.mPresContext, aTextFrame, aParentFrame);
-    // Repair the continuations style context
-    nsStyleContext* parentStyleContext = aStyleContext->GetParentAllowServo();
-    if (parentStyleContext) {
-      RefPtr<nsStyleContext> newSC = styleSet->
-        ResolveStyleForText(aTextContent, parentStyleContext);
-      nextTextFrame->SetStyleContext(newSC);
-    }
+    RefPtr<nsStyleContext> newSC = styleSet->
+      ResolveStyleForText(aTextContent, aParentStyleContext);
+    nextTextFrame->SetStyleContext(newSC);
   }
 
   NS_ASSERTION(aResult.IsEmpty(), "aResult should be an empty nsFrameItems!");
   // Put the new float before any of the floats in the block we're doing
   // first-letter for, that is, before any floats whose parent is
   // containingBlock.
   nsFrameList::FrameLinkEnumerator link(aState.mFloatedItems);
   while (!link.AtEnd() && link.NextFrame()->GetParent() != containingBlock) {
@@ -11787,18 +11786,18 @@ nsCSSFrameConstructor::CreateLetterFrame
                                      nsCSSPseudoElements::firstLetter)->
       StyleContext();
 
   // Use content from containing block so that we can actually
   // find a matching style rule.
   nsIContent* blockContent = aBlockFrame->GetContent();
 
   // Create first-letter style rule
-  RefPtr<nsStyleContext> sc = GetFirstLetterStyle(blockContent,
-                                                    parentStyleContext);
+  RefPtr<nsStyleContext> sc =
+    GetFirstLetterStyle(blockContent, parentStyleContext);
   if (sc) {
     RefPtr<nsStyleContext> textSC = mPresShell->StyleSet()->
       ResolveStyleForText(aTextContent, sc);
 
     // Create a new text frame (the original one will be discarded)
     // pass a temporary stylecontext, the correct one will be set
     // later.  Start off by unsetting the primary frame for
     // aTextContent, so it's no longer pointing to the to-be-destroyed
@@ -11819,17 +11818,18 @@ nsCSSFrameConstructor::CreateLetterFrame
 
     // Create the right type of first-letter frame
     const nsStyleDisplay* display = sc->StyleDisplay();
     nsFirstLetterFrame* letterFrame;
     if (display->IsFloatingStyle() &&
         !nsSVGUtils::IsInSVGTextSubtree(aParentFrame)) {
       // Make a floating first-letter frame
       letterFrame = CreateFloatingLetterFrame(state, aTextContent, textFrame,
-                                              aParentFrame, sc, aResult);
+                                              aParentFrame, parentStyleContext,
+                                              sc, aResult);
     }
     else {
       // Make an inflow first-letter frame
       letterFrame = NS_NewFirstLetterFrame(mPresShell, sc);
 
       // Initialize the first-letter-frame.  We don't want to use a text
       // content for a non-text frame (because we want its primary frame to
       // be a text frame).  So use its parent for the first-letter.

--- a/layout/base/nsCSSFrameConstructor.h
+++ b/layout/base/nsCSSFrameConstructor.h
@@ -1944,16 +1944,17 @@ private:
 
   // Methods support :first-letter style
 
   nsFirstLetterFrame*
   CreateFloatingLetterFrame(nsFrameConstructorState& aState,
                             nsIContent*              aTextContent,
                             nsIFrame*                aTextFrame,
                             nsContainerFrame*        aParentFrame,
+                            nsStyleContext*          aParentStyleContext,
                             nsStyleContext*          aStyleContext,
                             nsFrameItems&            aResult);
 
   void CreateLetterFrame(nsContainerFrame*        aBlockFrame,
                          nsContainerFrame*        aBlockContinuation,
                          nsIContent*              aTextContent,
                          nsContainerFrame*        aParentFrame,
                          nsFrameItems&            aResult);