diff --git a/layout/style/CSSStyleSheet.cpp b/layout/style/CSSStyleSheet.cpp
index aa329295de6a..9b033e078998 100644
--- a/layout/style/CSSStyleSheet.cpp
+++ b/layout/style/CSSStyleSheet.cpp
@@ -600,19 +600,9 @@ CSSStyleSheet::HasRules() const
 }
 
 void
-CSSStyleSheet::SetEnabled(bool aEnabled)
+CSSStyleSheet::EnabledStateChangedInternal()
 {
-  // Internal method, so callers must handle BeginUpdate/EndUpdate
-  bool oldDisabled = mDisabled;
-  mDisabled = !aEnabled;
-
-  if (mInner->mComplete && oldDisabled != mDisabled) {
-    ClearRuleCascades();
-
-    if (mDocument) {
-      mDocument->SetStyleSheetApplicableState(this, !mDisabled);
-    }
-  }
+  ClearRuleCascades();
 }
 
 CSSStyleSheet*
diff --git a/layout/style/CSSStyleSheet.h b/layout/style/CSSStyleSheet.h
index f18d2c5bf9c1..4d2b52cbe645 100644
--- a/layout/style/CSSStyleSheet.h
+++ b/layout/style/CSSStyleSheet.h
@@ -115,17 +115,6 @@ public:
 
   bool HasRules() const;
 
-  /**
-   * Set the stylesheet to be enabled.  This may or may not make it
-   * applicable.  Note that this WILL inform the sheet's document of
-   * its new applicable state if the state changes but WILL NOT call
-   * BeginUpdate() or EndUpdate() on the document -- calling those is
-   * the caller's responsibility.  This allows use of SetEnabled when
-   * batched updates are desired.  If you want updates handled for
-   * you, see nsIDOMStyleSheet::SetDisabled().
-   */
-  void SetEnabled(bool aEnabled);
-
   // style sheet owner info
   CSSStyleSheet* GetParentSheet() const;  // may be null
   void SetOwningDocument(nsIDocument* aDocument);
@@ -243,6 +232,8 @@ protected:
                               uint32_t aIndex, ErrorResult& aRv);
   void DeleteRuleInternal(uint32_t aIndex, ErrorResult& aRv);
 
+  void EnabledStateChangedInternal();
+
   RefPtr<CSSStyleSheet> mNext;
   CSSStyleSheet*        mParent;    // weak ref
   css::ImportRule*      mOwnerRule; // weak ref
diff --git a/layout/style/Loader.cpp b/layout/style/Loader.cpp
index 4ace784530e4..0233c0fb7764 100644
--- a/layout/style/Loader.cpp
+++ b/layout/style/Loader.cpp
@@ -1307,7 +1307,7 @@ Loader::PrepareSheet(StyleSheet* aSheet,
   aSheet->SetMedia(mediaList);
 
   aSheet->SetTitle(aTitle);
-  sheet->SetEnabled(!aIsAlternate);
+  aSheet->SetEnabled(!aIsAlternate);
   sheet->SetScopeElement(aScopeElement);
 }
 
diff --git a/layout/style/ServoStyleSheet.h b/layout/style/ServoStyleSheet.h
index cb7c80cd0678..e1387ed69d74 100644
--- a/layout/style/ServoStyleSheet.h
+++ b/layout/style/ServoStyleSheet.h
@@ -84,6 +84,8 @@ protected:
                               uint32_t aIndex, ErrorResult& aRv);
   void DeleteRuleInternal(uint32_t aIndex, ErrorResult& aRv);
 
+  void EnabledStateChangedInternal() {}
+
 private:
   void DropSheet();
 
diff --git a/layout/style/StyleSheet.cpp b/layout/style/StyleSheet.cpp
index 611f48efb097..b7cd6135d3c3 100644
--- a/layout/style/StyleSheet.cpp
+++ b/layout/style/StyleSheet.cpp
@@ -115,6 +115,22 @@ StyleSheet::SetComplete()
   }
 }
 
+void
+StyleSheet::SetEnabled(bool aEnabled)
+{
+  // Internal method, so callers must handle BeginUpdate/EndUpdate
+  bool oldDisabled = mDisabled;
+  mDisabled = !aEnabled;
+
+  if (IsComplete() && oldDisabled != mDisabled) {
+    EnabledStateChanged();
+
+    if (mDocument) {
+      mDocument->SetStyleSheetApplicableState(this, !mDisabled);
+    }
+  }
+}
+
 StyleSheetInfo::StyleSheetInfo(CORSMode aCORSMode,
                                ReferrerPolicy aReferrerPolicy,
                                const dom::SRIMetadata& aIntegrity)
@@ -282,6 +298,12 @@ StyleSheet::DeleteRule(uint32_t aIndex,
   FORWARD_INTERNAL(DeleteRuleInternal, (aIndex, aRv))
 }
 
+void
+StyleSheet::EnabledStateChanged()
+{
+  FORWARD_INTERNAL(EnabledStateChangedInternal, ())
+}
+
 #undef FORWARD_INTERNAL
 
 void
diff --git a/layout/style/StyleSheet.h b/layout/style/StyleSheet.h
index 45913259cdbe..b12200c75fd5 100644
--- a/layout/style/StyleSheet.h
+++ b/layout/style/StyleSheet.h
@@ -67,6 +67,17 @@ public:
   bool IsComplete() const;
   void SetComplete();
 
+  /**
+   * Set the stylesheet to be enabled.  This may or may not make it
+   * applicable.  Note that this WILL inform the sheet's document of
+   * its new applicable state if the state changes but WILL NOT call
+   * BeginUpdate() or EndUpdate() on the document -- calling those is
+   * the caller's responsibility.  This allows use of SetEnabled when
+   * batched updates are desired.  If you want updates handled for
+   * you, see nsIDOMStyleSheet::SetDisabled().
+   */
+  void SetEnabled(bool aEnabled);
+
   MOZ_DECL_STYLO_METHODS(CSSStyleSheet, ServoStyleSheet)
 
   // Whether the sheet is for an inline <style> element.
@@ -198,6 +209,9 @@ protected:
   // Drop our reference to mMedia
   void DropMedia();
 
+  // Called from SetEnabled when the enabled state changed.
+  void EnabledStateChanged();
+
   nsString              mTitle;
   nsIDocument*          mDocument; // weak ref; parents maintain this for their children
   nsINode*              mOwningNode; // weak ref