diff --git a/layout/base/ArenaRefPtr.h b/layout/base/ArenaRefPtr.h
index bc8ecaa70d37..741fd5f4c95a 100644
--- a/layout/base/ArenaRefPtr.h
+++ b/layout/base/ArenaRefPtr.h
@@ -97,15 +97,10 @@ public:
 
   ~ArenaRefPtr() { assign(nullptr); }
 
-#ifdef MOZ_HAVE_REF_QUALIFIERS
   operator T*() const & { return get(); }
   operator T*() const && = delete;
   explicit operator bool() const { return !!mPtr; }
   bool operator!() const { return !mPtr; }
-#else
-  operator T*() const { return get(); }
-#endif
-
   T* operator->() const { return mPtr.operator->(); }
   T& operator*() const { return *get(); }
 
diff --git a/mfbt/Attributes.h b/mfbt/Attributes.h
index df6172f31b5a..47ab277e2bb0 100644
--- a/mfbt/Attributes.h
+++ b/mfbt/Attributes.h
@@ -551,22 +551,6 @@
 
 #define MOZ_RAII MOZ_NON_TEMPORARY_CLASS MOZ_STACK_CLASS
 
-/*
- * MOZ_HAVE_REF_QUALIFIERS is defined for compilers that support C++11's rvalue
- * qualifier, "&&".
- */
-#if defined(_MSC_VER) && _MSC_VER >= 1900
-#  define MOZ_HAVE_REF_QUALIFIERS
-#elif defined(__clang__)
-// All supported Clang versions
-#  define MOZ_HAVE_REF_QUALIFIERS
-#elif defined(__GNUC__)
-#  include "mozilla/Compiler.h"
-#  if MOZ_GCC_VERSION_AT_LEAST(4, 8, 1)
-#    define MOZ_HAVE_REF_QUALIFIERS
-#  endif
-#endif
-
 #endif /* __cplusplus */
 
 /**
diff --git a/mfbt/RefPtr.h b/mfbt/RefPtr.h
index bfa8f6e02a68..2de5a74c3b46 100644
--- a/mfbt/RefPtr.h
+++ b/mfbt/RefPtr.h
@@ -283,10 +283,7 @@ public:
     return const_cast<T*>(mRawPtr);
   }
 
-  operator T*() const
-#ifdef MOZ_HAVE_REF_QUALIFIERS
-  &
-#endif
+  operator T*() const &
   /*
     ...makes an |RefPtr| act like its underlying raw pointer type whenever it
     is used in a context where a raw pointer is expected.  It is this operator
@@ -299,7 +296,6 @@ public:
     return get();
   }
 
-#ifdef MOZ_HAVE_REF_QUALIFIERS
   // Don't allow implicit conversion of temporary RefPtr to raw pointer,
   // because the refcount might be one and the pointer will immediately become
   // invalid.
@@ -310,7 +306,6 @@ public:
   // operator bool instead of the deleted operator T*?
   explicit operator bool() const { return !!mRawPtr; }
   bool operator!() const { return !mRawPtr; }
-#endif
 
   T*
   operator->() const MOZ_NO_ADDREF_RELEASE_ON_RETURN
diff --git a/xpcom/glue/nsCOMPtr.h b/xpcom/glue/nsCOMPtr.h
index 373f55cbb9d5..7505550d8ae9 100644
--- a/xpcom/glue/nsCOMPtr.h
+++ b/xpcom/glue/nsCOMPtr.h
@@ -747,13 +747,8 @@ public:
   //
   // Prefer the implicit use of this operator to calling |get()|, except where
   // necessary to resolve ambiguity.
-  operator T*() const
-#ifdef MOZ_HAVE_REF_QUALIFIERS
-  &
-#endif
-  { return get(); }
+  operator T*() const & { return get(); }
 
-#ifdef MOZ_HAVE_REF_QUALIFIERS
   // Don't allow implicit conversion of temporary nsCOMPtr to raw pointer,
   // because the refcount might be one and the pointer will immediately become
   // invalid.
@@ -761,7 +756,6 @@ public:
 
   // Needed to avoid the deleted operator above
   explicit operator bool() const { return !!mRawPtr; }
-#endif
 
   T* operator->() const MOZ_NO_ADDREF_RELEASE_ON_RETURN
   {
@@ -1468,5 +1462,4 @@ RefPtr<T>::operator=(const nsCOMPtr_helper& aHelper)
   return *this;
 }
 
-
 #endif // !defined(nsCOMPtr_h___)