--- a/layout/style/nsCSSRules.cpp
+++ b/layout/style/nsCSSRules.cpp
@@ -78,27 +78,32 @@ Rule::IsCCLeaf() const
 
 bool
 Rule::IsKnownLive() const
 {
   if (IsBlack()) {
     return true;
   }
 
+#if 1
+  return false;
+#else
+  // Disabled pending bug 1332704 getting resolved for now.
   StyleSheet* sheet = GetStyleSheet();
   if (!sheet) {
     return false;
   }
 
   if (!sheet->IsOwnedByDocument()) {
     return false;
   }
 
   return nsCCUncollectableMarker::InGeneration(
     sheet->GetAssociatedDocument()->GetMarkedCCGeneration());
+#endif
 }
 
 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(Rule)
   return tmp->IsCCLeaf() || tmp->IsKnownLive();
 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
 
 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(Rule)
   // Please see documentation for nsCycleCollectionParticipant::CanSkip* for why