diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index b0dae69150..085e0e5ef4 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -9338,7 +9338,7 @@ nsLayoutUtils::ComputeGeometryBox(nsIFrame* aFrame,
   return r;
 }
 
-/* static */ nsStyleContext*
+/* static */ already_AddRefed<nsStyleContext>
 nsLayoutUtils::GetNonAnonymousStyleContext(nsIFrame* aFrame)
 {
   nsIContent* node = aFrame->GetContent();
@@ -9348,7 +9348,8 @@ nsLayoutUtils::GetNonAnonymousStyleContext(nsIFrame* aFrame)
   }
   MOZ_ASSERT(node, "Native anonymous element with no originating node?");
   if (nsIFrame* primaryFrame = node->GetPrimaryFrame()) {
-    return primaryFrame->StyleContext();
+    RefPtr<nsStyleContext> context = primaryFrame->StyleContext();
+    return context.forget();
   }
   // If the element doesn't have primary frame, get the computed style
   // from the element directly.
@@ -9356,9 +9357,5 @@ nsLayoutUtils::GetNonAnonymousStyleContext(nsIFrame* aFrame)
   MOZ_ASSERT(node == pc->Document()->GetRootElement(),
              "Root element is the only case for this fallback "
              "path to be triggered");
-  RefPtr<nsStyleContext> styleContext =
-      pc->StyleSet()->ResolveStyleFor(node->AsElement(), nullptr);
-  // Dropping the strong reference is fine because the style should be
-  // held strongly by the element.
-  return styleContext.get();
+  return pc->StyleSet()->ResolveStyleFor(node->AsElement(), nullptr);
 }
diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h
index ea9a026007..b18edbc9c9 100644
--- a/layout/base/nsLayoutUtils.h
+++ b/layout/base/nsLayoutUtils.h
@@ -2885,7 +2885,7 @@ public:
    * @param aFrame The frame associated with native anonymous content.
    * @return The resolved style context of the nearest non-anonymous DOM ancestor.
    */
-  static nsStyleContext* GetNonAnonymousStyleContext(nsIFrame* aFrame);
+  static already_AddRefed<nsStyleContext> GetNonAnonymousStyleContext(nsIFrame* aFrame);
 
 private:
   static uint32_t sFontSizeInflationEmPerLine;
diff --git a/layout/generic/nsGfxScrollFrame.cpp b/layout/generic/nsGfxScrollFrame.cpp
index 53b028837b..f6fe2bf77f 100644
--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -1060,7 +1060,7 @@ nsHTMLScrollFrame::Reflow(nsPresContext* aPresContext,
     // This is only needed for root element because scrollbars of non-
     // root elements with "scrollbar-width: none" is already suppressed
     // in ScrollFrameHelper::CreateAnonymousContent.
-    nsStyleContext* scrollbarStyle = nsLayoutUtils::GetNonAnonymousStyleContext(this);
+    RefPtr<nsStyleContext> scrollbarStyle = nsLayoutUtils::GetNonAnonymousStyleContext(this);
     auto scrollbarWidth = scrollbarStyle->StyleUIReset()->mScrollbarWidth;
     if (scrollbarWidth == StyleScrollbarWidth::None) {
       state.mVScrollbar = ShowScrollbar::Never;
diff --git a/widget/cocoa/nsNativeThemeCocoa.mm b/widget/cocoa/nsNativeThemeCocoa.mm
index 056c453f2a..ad16ecb0ec 100644
--- a/widget/cocoa/nsNativeThemeCocoa.mm
+++ b/widget/cocoa/nsNativeThemeCocoa.mm
@@ -2282,7 +2282,9 @@ IsHiDPIContext(nsPresContext* aContext)
 static bool
 IsScrollbarWidthThin(nsIFrame* aFrame)
 {
-  return aFrame->StyleUserInterface()->mScrollbarWidth == StyleScrollbarWidth::Thin;
+  RefPtr<nsStyleContext> styleContext = nsLayoutUtils::GetNonAnonymousStyleContext(aFrame);
+  auto scrollbarWidth = styleContext->StyleUIReset()->mScrollbarWidth;
+  return scrollbarWidth == StyleScrollbarWidth::Thin;
 }
 
 NS_IMETHODIMP
diff --git a/widget/gtk/nsNativeThemeGTK.cpp b/widget/gtk/nsNativeThemeGTK.cpp
index cb4e7debf2..59f611e723 100644
--- a/widget/gtk/nsNativeThemeGTK.cpp
+++ b/widget/gtk/nsNativeThemeGTK.cpp
@@ -1101,7 +1101,9 @@ nsNativeThemeGTK::GetExtraSizeForWidget(nsIFrame* aFrame, uint8_t aWidgetType,
 static bool
 IsScrollbarWidthThin(nsIFrame* aFrame)
 {
-  return aFrame->StyleUserInterface()->mScrollbarWidth == StyleScrollbarWidth::Thin;
+  RefPtr<nsStyleContext> styleContext = nsLayoutUtils::GetNonAnonymousStyleContext(aFrame);
+  auto scrollbarWidth = styleContext->StyleUIReset()->mScrollbarWidth;
+  return scrollbarWidth == StyleScrollbarWidth::Thin;
 }
 
 NS_IMETHODIMP
diff --git a/widget/windows/nsNativeThemeWin.cpp b/widget/windows/nsNativeThemeWin.cpp
index 3250fec5c9..cb14f74f69 100644
--- a/widget/windows/nsNativeThemeWin.cpp
+++ b/widget/windows/nsNativeThemeWin.cpp
@@ -1572,7 +1572,7 @@ GetThemeDpiScaleFactor(nsIFrame* aFrame)
 static bool
 IsScrollbarWidthThin(nsIFrame* aFrame)
 {
-  nsStyleContext* styleContext = nsLayoutUtils::GetNonAnonymousStyleContext(aFrame);
+  RefPtr<nsStyleContext> styleContext = nsLayoutUtils::GetNonAnonymousStyleContext(aFrame);
   auto scrollbarWidth = styleContext->StyleUIReset()->mScrollbarWidth;
   return scrollbarWidth == StyleScrollbarWidth::Thin;
 }