--- a/xpcom/ds/nsTArray.h
+++ b/xpcom/ds/nsTArray.h
@@ -2462,16 +2462,23 @@ public:
 
   explicit AutoTArray(const base_type& aOther)
     : mAlign()
   {
     Init();
     this->AppendElements(aOther);
   }
 
+  AutoTArray(self_type&& aOther)
+    : mAlign()
+  {
+    Init();
+    this->SwapElements(aOther);
+  }
+
   explicit AutoTArray(base_type&& aOther)
     : mAlign()
   {
     Init();
     this->SwapElements(aOther);
   }
 
   template<typename Allocator>
@@ -2489,16 +2496,23 @@ public:
   }
 
   self_type& operator=(const self_type& aOther)
   {
     base_type::operator=(aOther);
     return *this;
   }
 
+  self_type& operator=(self_type&& aOther)
+  {
+    this->~self_type();
+    new (this) self_type(std::move(aOther));
+    return *this;
+  }
+
   template<typename Allocator>
   self_type& operator=(const nsTArray_Impl<elem_type, Allocator>& aOther)
   {
     base_type::operator=(aOther);
     return *this;
   }
 
 private: