diff --git a/dom/svg/SVGContentUtils.cpp b/dom/svg/SVGContentUtils.cpp
index 062a67780948c..d95e9cef5c520 100644
--- a/dom/svg/SVGContentUtils.cpp
+++ b/dom/svg/SVGContentUtils.cpp
@@ -814,7 +814,7 @@ float SVGContentUtils::CoordToFloat(SVGElement* aContent,
     return CSSCoord(ctx ? ctx->GetLength(SVGContentUtils::XY) : 0.0f);
   });
   if (aLength.IsCalc()) {
-    auto& calc = aLength.AsCalc();
+    const auto& calc = aLength.AsCalc();
     if (calc.clamping_mode == StyleAllowedNumericType::NonNegative) {
       result = std::max(result, 0.0f);
     } else {
diff --git a/layout/svg/CSSClipPathInstance.cpp b/layout/svg/CSSClipPathInstance.cpp
index 0fdf4252bb771..74f72dc10e1b0 100644
--- a/layout/svg/CSSClipPathInstance.cpp
+++ b/layout/svg/CSSClipPathInstance.cpp
@@ -28,7 +28,7 @@ namespace mozilla {
 /* static*/
 void CSSClipPathInstance::ApplyBasicShapeOrPathClip(
     gfxContext& aContext, nsIFrame* aFrame, const gfxMatrix& aTransform) {
-  auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
+  const auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
   MOZ_ASSERT(clipPathStyle.IsShape() || clipPathStyle.IsBox() ||
                  clipPathStyle.IsPath(),
              "This is used with basic-shape, geometry-box, and path() only");
@@ -48,7 +48,7 @@ void CSSClipPathInstance::ApplyBasicShapeOrPathClip(
 /* static*/
 bool CSSClipPathInstance::HitTestBasicShapeOrPathClip(nsIFrame* aFrame,
                                                       const gfxPoint& aPoint) {
-  auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
+  const auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
   MOZ_ASSERT(!clipPathStyle.IsNone(), "unexpected none value");
   // In the future CSSClipPathInstance may handle <clipPath> references as
   // well. For the time being return early.
diff --git a/layout/svg/SVGClipPathFrame.cpp b/layout/svg/SVGClipPathFrame.cpp
index cf8e6e5263d33..a93fe5a6c9902 100644
--- a/layout/svg/SVGClipPathFrame.cpp
+++ b/layout/svg/SVGClipPathFrame.cpp
@@ -475,7 +475,7 @@ SVGBBox SVGClipPathFrame::GetBBoxForClipPathFrame(const SVGBBox& aBBox,
 
 bool SVGClipPathFrame::IsSVGTransformed(Matrix* aOwnTransforms,
                                         Matrix* aFromParentTransforms) const {
-  auto e = static_cast<SVGElement const*>(GetContent());
+  const auto* e = static_cast<SVGElement const*>(GetContent());
   Matrix m = ToMatrix(e->PrependLocalTransformsTo({}, eUserSpaceToParent));
 
   if (m.IsIdentity()) {
diff --git a/layout/svg/SVGContextPaint.cpp b/layout/svg/SVGContextPaint.cpp
index 8bf6637516447..c40fb2f55a947 100644
--- a/layout/svg/SVGContextPaint.cpp
+++ b/layout/svg/SVGContextPaint.cpp
@@ -189,7 +189,8 @@ SVGContextPaint* SVGContextPaint::GetContextPaint(nsIContent* aContent) {
     return nullptr;
   }
 
-  auto* contextPaint = ownerDoc->AsSVGDocument()->GetCurrentContextPaint();
+  const auto* contextPaint =
+      ownerDoc->AsSVGDocument()->GetCurrentContextPaint();
   MOZ_ASSERT_IF(contextPaint, ownerDoc->IsBeingUsedAsImage());
 
   // XXX The SVGContextPaint that SVGDocument keeps around is const. We could
diff --git a/layout/svg/SVGGeometryFrame.cpp b/layout/svg/SVGGeometryFrame.cpp
index 25e88e363eb0e..57ad64f49b365 100644
--- a/layout/svg/SVGGeometryFrame.cpp
+++ b/layout/svg/SVGGeometryFrame.cpp
@@ -93,7 +93,7 @@ void DisplaySVGGeometry::Paint(nsDisplayListBuilder* aBuilder,
 void DisplaySVGGeometry::ComputeInvalidationRegion(
     nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
     nsRegion* aInvalidRegion) const {
-  auto geometry =
+  const auto* geometry =
       static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);
 
   if (aBuilder->ShouldSyncDecodeImages() &&
@@ -141,7 +141,7 @@ void SVGGeometryFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
     SVGGeometryElement* element =
         static_cast<SVGGeometryElement*>(GetContent());
 
-    auto* oldStyleSVG = aOldComputedStyle->StyleSVG();
+    const auto* oldStyleSVG = aOldComputedStyle->StyleSVG();
     if (!SVGContentUtils::ShapeTypeHasNoCorners(GetContent())) {
       if (StyleSVG()->mStrokeLinecap != oldStyleSVG->mStrokeLinecap &&
           element->IsSVGElement(nsGkAtoms::path)) {
@@ -729,7 +729,7 @@ void SVGGeometryFrame::Render(gfxContext* aContext, uint32_t aRenderComponents,
 void SVGGeometryFrame::PaintMarkers(gfxContext& aContext,
                                     const gfxMatrix& aTransform,
                                     imgDrawingParams& aImgParams) {
-  auto element = static_cast<SVGGeometryElement*>(GetContent());
+  auto* element = static_cast<SVGGeometryElement*>(GetContent());
 
   if (element->IsMarkable()) {
     SVGMarkerFrame* markerFrames[SVGMark::eTypeCount];
diff --git a/layout/svg/SVGGradientFrame.cpp b/layout/svg/SVGGradientFrame.cpp
index 3c292e2c6459a..6d997f9de1477 100644
--- a/layout/svg/SVGGradientFrame.cpp
+++ b/layout/svg/SVGGradientFrame.cpp
@@ -248,8 +248,8 @@ already_AddRefed<gfxPattern> SVGGradientFrame::GetPaintServerPattern(
   }
 
   if (nStops == 1 || GradientVectorLengthIsZero()) {
-    auto lastStopFrame = stopFrames[nStops - 1];
-    auto svgReset = lastStopFrame->StyleSVGReset();
+    auto* lastStopFrame = stopFrames[nStops - 1];
+    const auto* svgReset = lastStopFrame->StyleSVGReset();
     // The gradient paints a single colour, using the stop-color of the last
     // gradient step if there are more than one.
     float stopOpacity = svgReset->mStopOpacity;
diff --git a/layout/svg/SVGObserverUtils.cpp b/layout/svg/SVGObserverUtils.cpp
index abd79077a99c2..4992863c7409d 100644
--- a/layout/svg/SVGObserverUtils.cpp
+++ b/layout/svg/SVGObserverUtils.cpp
@@ -50,11 +50,11 @@ class URLAndReferrerInfoHashKey : public PLDHashEntryHdr {
   using KeyType = const URLAndReferrerInfo*;
   using KeyTypePointer = const URLAndReferrerInfo*;
 
-  explicit URLAndReferrerInfoHashKey(const URLAndReferrerInfo* aKey)
+  explicit URLAndReferrerInfoHashKey(const URLAndReferrerInfo* aKey) noexcept
       : mKey(aKey) {
     MOZ_COUNT_CTOR(URLAndReferrerInfoHashKey);
   }
-  URLAndReferrerInfoHashKey(URLAndReferrerInfoHashKey&& aToMove)
+  URLAndReferrerInfoHashKey(URLAndReferrerInfoHashKey&& aToMove) noexcept
       : PLDHashEntryHdr(std::move(aToMove)), mKey(std::move(aToMove.mKey)) {
     MOZ_COUNT_CTOR(URLAndReferrerInfoHashKey);
   }
diff --git a/layout/svg/SVGOuterSVGFrame.cpp b/layout/svg/SVGOuterSVGFrame.cpp
index 6518161dbfdc7..f76174c480f41 100644
--- a/layout/svg/SVGOuterSVGFrame.cpp
+++ b/layout/svg/SVGOuterSVGFrame.cpp
@@ -674,7 +674,7 @@ void nsDisplayOuterSVG::ComputeInvalidationRegion(
   nsDisplayItem::ComputeInvalidationRegion(aBuilder, aGeometry, aInvalidRegion);
   aInvalidRegion->Or(*aInvalidRegion, result);
 
-  auto geometry =
+  const auto* geometry =
       static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);
 
   if (aBuilder->ShouldSyncDecodeImages() &&
diff --git a/layout/svg/SVGUtils.cpp b/layout/svg/SVGUtils.cpp
index d2720644a1bcd..9ad989293f4da 100644
--- a/layout/svg/SVGUtils.cpp
+++ b/layout/svg/SVGUtils.cpp
@@ -933,7 +933,7 @@ gfxRect SVGUtils::GetClipRectForFrame(nsIFrame* aFrame, float aX, float aY,
     return gfxRect(aX, aY, aWidth, aHeight);
   }
 
-  auto& rect = effects->mClip.AsRect();
+  const auto& rect = effects->mClip.AsRect();
   nsRect coordClipRect = rect.ToLayoutRect();
   nsIntRect clipPxRect = coordClipRect.ToOutsidePixels(
       aFrame->PresContext()->AppUnitsPerDevPixel());