diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
index 2d7c99c914c0..feaee86ca5fd 100644
--- a/dom/base/Document.cpp
+++ b/dom/base/Document.cpp
@@ -14778,7 +14778,7 @@ void Document::GetWireframeWithoutFlushing(bool aIncludeNodes,
       }
       bool drawImage = false;
       bool drawColor = false;
-      if (auto* bgStyle = nsCSSRendering::FindBackground(frame)) {
+      if (const auto* bgStyle = nsCSSRendering::FindBackground(frame)) {
         const nscolor color = nsCSSRendering::DetermineBackgroundColor(
             pc, bgStyle, frame, drawImage, drawColor);
         if (drawImage &&
diff --git a/layout/base/PresShell.cpp b/layout/base/PresShell.cpp
index 86a3f5a70b63..d0f5c752648f 100644
--- a/layout/base/PresShell.cpp
+++ b/layout/base/PresShell.cpp
@@ -5462,7 +5462,7 @@ PresShell::CanvasBackground PresShell::ComputeCanvasBackground() const {
     return {GetDefaultBackgroundColorToDraw(), false};
   }
 
-  ComputedStyle* bgStyle =
+  const ComputedStyle* bgStyle =
       nsCSSRendering::FindRootFrameBackground(rootStyleFrame);
   // XXX We should really be passing the canvasframe, not the root element
   // style frame but we don't have access to the canvasframe here. It isn't
diff --git a/layout/generic/nsBlockFrame.cpp b/layout/generic/nsBlockFrame.cpp
index 33e7c565445c..02631b34a882 100644
--- a/layout/generic/nsBlockFrame.cpp
+++ b/layout/generic/nsBlockFrame.cpp
@@ -237,7 +237,7 @@ static nscolor GetBackplateColor(nsIFrame* aFrame) {
     // colors with the non-native theme, and native system colors should also
     // match the native theme), then we're alright and we should compute an
     // appropriate backplate color.
-    auto* style = frame->Style();
+    const auto* style = frame->Style();
     if (style->StyleBackground()->IsTransparent(style)) {
       continue;
     }
diff --git a/layout/painting/nsDisplayList.cpp b/layout/painting/nsDisplayList.cpp
index 43b6371dabc3..e7d7d14b6b2f 100644
--- a/layout/painting/nsDisplayList.cpp
+++ b/layout/painting/nsDisplayList.cpp
@@ -3104,7 +3104,7 @@ AppendedBackgroundType nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
     const nsRect& aBackgroundOriginRect, nsIFrame* aSecondaryReferenceFrame,
     Maybe<nsDisplayListBuilder::AutoBuildingDisplayList>*
         aAutoBuildingDisplayList) {
-  ComputedStyle* bgSC = aComputedStyle;
+  const ComputedStyle* bgSC = aComputedStyle;
   const nsStyleBackground* bg = nullptr;
   nsRect bgRect = aBackgroundRect;
   nsRect bgOriginRect = bgRect;