diff --git a/layout/base/nsDisplayList.cpp b/layout/base/nsDisplayList.cpp
index d619576baf..c830891a50 100644
--- a/layout/base/nsDisplayList.cpp
+++ b/layout/base/nsDisplayList.cpp
@@ -1096,7 +1096,6 @@ void
 nsDisplayListBuilder::MarkFramesForDisplayList(nsIFrame* aDirtyFrame,
                                                const nsFrameList& aFrames,
                                                const nsRect& aDirtyRect) {
-  mFramesMarkedForDisplay.SetCapacity(mFramesMarkedForDisplay.Length() + aFrames.GetLength());
   for (nsIFrame* e : aFrames) {
     // Skip the AccessibleCaret frame when building no caret.
     if (!IsBuildingCaret()) {
@@ -1108,6 +1107,7 @@ nsDisplayListBuilder::MarkFramesForDisplayList(nsIFrame* aDirtyFrame,
         }
       }
     }
+    
     mFramesMarkedForDisplay.AppendElement(e);
     MarkOutOfFlowFrameForDisplay(aDirtyFrame, e, aDirtyRect);
   }
diff --git a/layout/base/nsDisplayList.h b/layout/base/nsDisplayList.h
index c9f773f5b6..fcdc9e4fc0 100644
--- a/layout/base/nsDisplayList.h
+++ b/layout/base/nsDisplayList.h
@@ -1200,7 +1200,7 @@ private:
   PLArenaPool                    mPool;
   nsCOMPtr<nsISelection>         mBoundingSelection;
   AutoTArray<PresShellState,8> mPresShellStates;
-  AutoTArray<nsIFrame*,100>    mFramesMarkedForDisplay;
+  AutoTArray<nsIFrame*,400>    mFramesMarkedForDisplay;
   AutoTArray<ThemeGeometry,2>  mThemeGeometries;
   nsDisplayTableItem*            mCurrentTableItem;
   DisplayListClipState           mClipState;