Index: src/JsValue.cpp
===================================================================
--- a/src/JsValue.cpp
+++ b/src/JsValue.cpp
@@ -168,16 +168,21 @@
   obj->Set(property, val);
 }
 
 v8::Local<v8::Value> AdblockPlus::JsValue::UnwrapValue() const
 {
   return v8::Local<v8::Value>::New(jsEngine->GetIsolate(), *value);
 }
 
+JsValue AdblockPlus::JsValue::Clone() const
+{
+  return JsValue(jsEngine, UnwrapValue());
+}
+
 void AdblockPlus::JsValue::SetProperty(const std::string& name, const std::string& val)
 {
   const JsContext context(jsEngine);
   SetProperty(name, Utils::ToV8String(jsEngine->GetIsolate(), val));
 }
 
 void AdblockPlus::JsValue::SetProperty(const std::string& name, int64_t val)
 {