3 files changed, 9 insertions, 1 deletions
diff --git a/dom/base/CustomElementRegistry.cpp b/dom/base/CustomElementRegistry.cpp
index 1743779f0..75477dbaa 100644
--- a/dom/base/CustomElementRegistry.cpp
+++ b/dom/base/CustomElementRegistry.cpp
@@ -171,7 +171,7 @@ NS_INTERFACE_MAP_END
 /* static */ bool
 CustomElementRegistry::IsCustomElementEnabled(JSContext* aCx, JSObject* aObject)
 {
-  return Preferences::GetBool("dom.webcomponents.customelements.enabled") ||
+  return nsContentUtils::IsCustomElementsEnabled() ||
          nsContentUtils::IsWebComponentsEnabled();
 }
 
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index dd6835e57..b8ee09bf6 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -285,6 +285,7 @@ bool nsContentUtils::sIsPerformanceNavigationTimingEnabled = false;
 bool nsContentUtils::sIsUserTimingLoggingEnabled = false;
 bool nsContentUtils::sIsExperimentalAutocompleteEnabled = false;
 bool nsContentUtils::sIsWebComponentsEnabled = false;
+bool nsContentUtils::sIsCustomElementsEnabled = false;
 bool nsContentUtils::sEncodeDecodeURLHash = false;
 bool nsContentUtils::sGettersDecodeURLHash = false;
 bool nsContentUtils::sPrivacyResistFingerprinting = false;
@@ -588,6 +589,9 @@ nsContentUtils::Init()
   Preferences::AddBoolVarCache(&sIsWebComponentsEnabled,
                                "dom.webcomponents.enabled", false);
 
+  Preferences::AddBoolVarCache(&sIsCustomElementsEnabled,
+                               "dom.webcomponents.customelements.enabled", false);
+
   Preferences::AddBoolVarCache(&sEncodeDecodeURLHash,
                                "dom.url.encode_decode_hash", false);
 
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index 80f26c2b0..06a7b5ded 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -2746,6 +2746,9 @@ public:
   static bool
   IsWebComponentsEnabled() { return sIsWebComponentsEnabled; }
 
+  static bool
+  IsCustomElementsEnabled() { return sIsCustomElementsEnabled; }
+
 private:
   static bool InitializeEventTable();
 
@@ -2854,6 +2857,7 @@ private:
   static bool sIsFrameTimingPrefEnabled;
   static bool sIsExperimentalAutocompleteEnabled;
   static bool sIsWebComponentsEnabled;
+  static bool sIsCustomElementsEnabled;
   static bool sEncodeDecodeURLHash;
   static bool sGettersDecodeURLHash;
   static bool sPrivacyResistFingerprinting;