diff --git a/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.cpp b/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.cpp
index 31c04bf..438be2b 100644
--- a/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.cpp
+++ b/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.cpp
@@ -53,9 +53,7 @@ namespace NL::CEF
                         continue;
                     }
 
-                    ++addedFuncCount;
-
-                    if (!objectName.empty() || objectName != IPC_JS_WINDOW_OBJECT_NAME)
+                    if (!objectName.empty())
                     {
                         auto objectValue = currentObjectValue->GetValue(objectName);
                         if (objectValue == nullptr || objectValue->IsNull() || objectValue->IsUndefined())
@@ -69,6 +67,7 @@ namespace NL::CEF
                     CefRefPtr<NL::JS::CEFFunctionHandler> funcHandler = new NL::JS::CEFFunctionHandler(a_browser, objectName);
                     CefRefPtr<CefV8Value> funcValue = CefV8Value::CreateFunction(funcName, funcHandler);
                     currentObjectValue->SetValue(funcName, funcValue, V8_PROPERTY_ATTRIBUTE_NONE);
+                    ++addedFuncCount;
                 }
             }
         }
@@ -77,6 +76,60 @@ namespace NL::CEF
         return addedFuncCount;
     }
 
+    size_t NirnLabSubprocessCefApp::RemoveFunctionHandlers(CefRefPtr<CefBrowser> a_browser,
+                                                           CefRefPtr<CefFrame> a_frame,
+                                                           CefProcessId a_sourceProcess,
+                                                           CefRefPtr<CefDictionaryValue> a_funcDict)
+    {
+        size_t removedFuncCount = 0;
+        const auto v8Context = a_frame->GetV8Context();
+        if (!v8Context->Enter())
+        {
+            spdlog::error("{}[{}]: can't enter v8 context", NameOf(NirnLabSubprocessCefApp::RemoveFunctionHandlers), ::GetCurrentProcessId());
+            return removedFuncCount;
+        }
+
+        CefDictionaryValue::KeyList keyList;
+        if (!a_funcDict->GetKeys(keyList))
+        {
+            spdlog::error("{}[{}]: can't get keys from function dictionary", NameOf(NirnLabSubprocessCefApp::RemoveFunctionHandlers), ::GetCurrentProcessId());
+        }
+        else
+        {
+            for (const auto& objectName : keyList)
+            {
+                auto currentObjectValue = v8Context->GetGlobal();
+                const auto funcList = a_funcDict->GetList(objectName);
+                for (auto i = 0; i < funcList->GetSize(); ++i)
+                {
+                    const auto& funcName = funcList->GetString(i);
+                    if (funcName.empty())
+                    {
+                        continue;
+                    }
+
+                    if (!objectName.empty())
+                    {
+                        auto objectValue = currentObjectValue->GetValue(objectName);
+                        if (objectValue != nullptr && objectValue->IsObject())
+                        {
+                            currentObjectValue = objectValue;
+                        }
+                    }
+
+                    // Note: the window object does not allow deleting a custom function for some reason. Use different object. 
+                    if (currentObjectValue->DeleteValue(funcName))
+                    {
+                        ++removedFuncCount;
+                    }
+                }
+            }
+        }
+
+        v8Context->Exit();
+        return removedFuncCount;
+    }
+
     void NirnLabSubprocessCefApp::OnBeforeCommandLineProcessing(CefString const& process_type,
                                                                 CefRefPtr<CefCommandLine> command_line)
     {
@@ -154,6 +207,17 @@ namespace NL::CEF
             const auto addedFuncCount = AddFunctionHandlers(browser, frame, source_process, funcDict);
             spdlog::info("{}[{}]: registered {} functions for the browser with id {}", NameOf(NirnLabSubprocessCefApp::OnProcessMessageReceived), ::GetCurrentProcessId(), addedFuncCount, browser->GetIdentifier());
         }
+        else if (message->GetName() == IPC_JS_FUNCTION_REMOVE_EVENT)
+        {
+            const auto funcDict = message->GetArgumentList()->GetDictionary(0);
+            if (funcDict == nullptr)
+            {
+                return true;
+            }
+
+            const auto addedFuncCount = RemoveFunctionHandlers(browser, frame, source_process, funcDict);
+            spdlog::info("{}[{}]: removed {} functions for the browser with id {}", NameOf(NirnLabSubprocessCefApp::OnProcessMessageReceived), ::GetCurrentProcessId(), addedFuncCount, browser->GetIdentifier());
+        }
 
         return false;
     }
diff --git a/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.h b/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.h
index 905605c..0d4effa 100644
--- a/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.h
+++ b/src/CEFSubprocess/CEF/NirnLabSubprocessCefApp.h
@@ -26,6 +26,10 @@ namespace NL::CEF
                                    CefRefPtr<CefFrame> a_frame,
                                    CefProcessId a_sourceProcess,
                                    CefRefPtr<CefDictionaryValue> a_funcDict);
+        size_t RemoveFunctionHandlers(CefRefPtr<CefBrowser> a_browser,
+                                      CefRefPtr<CefFrame> a_frame,
+                                      CefProcessId a_sourceProcess,
+                                      CefRefPtr<CefDictionaryValue> a_funcDict);
 
         // CefApp
         void OnBeforeCommandLineProcessing(CefString const& process_type, CefRefPtr<CefCommandLine> command_line) override;
diff --git a/src/CEFSubprocess/IPC.h b/src/CEFSubprocess/IPC.h
index 3ef575b..ef1a2f5 100644
--- a/src/CEFSubprocess/IPC.h
+++ b/src/CEFSubprocess/IPC.h
@@ -7,3 +7,4 @@
 #define IPC_JS_CONTEXT_CREATED "js-context-created"
 #define IPC_JS_FUNCTION_CALL_EVENT "js-function-call"
 #define IPC_JS_FUNCION_ADD_EVENT "js-function-add"
+#define IPC_JS_FUNCTION_REMOVE_EVENT "js-function-remove"
diff --git a/src/UIPlatform/CEF/DefaultBrowser.cpp b/src/UIPlatform/CEF/DefaultBrowser.cpp
index 7df01cc..967f6df 100644
--- a/src/UIPlatform/CEF/DefaultBrowser.cpp
+++ b/src/UIPlatform/CEF/DefaultBrowser.cpp
@@ -57,8 +57,8 @@ namespace NL::CEF
         m_onMainFrameLoadStart_Connection = m_cefClient->onMainFrameLoadStart.connect([&]() {
             std::lock_guard locker(m_urlMutex);
             m_isPageLoaded = true;
-            
-            // JS funcs callback
+
+            // Add js func callbacks
             if (m_clearJSFunctions)
             {
                 m_jsFuncStorage->ClearFunctionCallback();
@@ -80,6 +80,13 @@ namespace NL::CEF
             }
             m_jsFuncCallbackInfoCache.clear();
 
+            // Remove js func callbacks
+            for (auto& funcInfo : m_jsFuncRemoveCache)
+            {
+                RemoveFunctionCallbackAndSendMessage(std::get<0>(funcInfo).c_str(), std::get<1>(funcInfo).c_str());
+            }
+            m_jsFuncRemoveCache.clear();
+
             // JS exec scripts
             if (!m_jsExecCache.empty())
             {
@@ -233,8 +240,25 @@ namespace NL::CEF
             auto dictValue = CefDictionaryValue::Create();
             auto listValue = CefListValue::Create();
             listValue->SetSize(1);
-            listValue->SetString(0, CefString(a_callbackInfo.funcName));
-            dictValue->SetList(CefString(a_callbackInfo.objectName), listValue);
+            listValue->SetString(0, a_callbackInfo.funcName);
+            dictValue->SetList(a_callbackInfo.objectName, listValue);
+            cefMessage->GetArgumentList()->SetDictionary(0, dictValue);
+            browser->GetMainFrame()->SendProcessMessage(CefProcessId::PID_RENDERER, cefMessage);
+        }
+    }
+
+    void DefaultBrowser::RemoveFunctionCallbackAndSendMessage(const char* a_objectName, const char* a_funcName)
+    {
+        m_jsFuncStorage->RemoveFunctionCallback(a_objectName, a_funcName);
+        const auto browser = m_cefClient->GetBrowser();
+        if (browser != nullptr)
+        {
+            auto cefMessage = CefProcessMessage::Create(IPC_JS_FUNCTION_REMOVE_EVENT);
+            auto dictValue = CefDictionaryValue::Create();
+            auto listValue = CefListValue::Create();
+            listValue->SetSize(1);
+            listValue->SetString(0, a_objectName);
+            dictValue->SetList(a_funcName, listValue);
             cefMessage->GetArgumentList()->SetDictionary(0, dictValue);
             browser->GetMainFrame()->SendProcessMessage(CefProcessId::PID_RENDERER, cefMessage);
         }
@@ -369,6 +393,14 @@ namespace NL::CEF
         std::lock_guard locker(m_urlMutex);
         if (!IsPageLoaded())
         {
+            for (auto it = m_jsFuncRemoveCache.begin(); it != m_jsFuncRemoveCache.end(); ++it)
+            {
+                if (std::get<0>(*it) == a_callbackInfo.objectName && std::get<1>(*it) == a_callbackInfo.funcName)
+                {
+                    m_jsFuncRemoveCache.erase(it);
+                }
+            }
+
             m_jsFuncCallbackInfoCache.push_back(a_callbackInfo);
             return;
         }
@@ -376,6 +408,34 @@ namespace NL::CEF
         AddFunctionCallbackAndSendMessage(a_callbackInfo);
     }
 
+    void __cdecl DefaultBrowser::RemoveFunctionCallback(const char* a_objectName, const char* a_funcName)
+    {
+        std::lock_guard locker(m_urlMutex);
+        if (!IsPageLoaded())
+        {
+            for (auto it = m_jsFuncCallbackInfoCache.begin(); it != m_jsFuncCallbackInfoCache.end(); ++it)
+            {
+                if (it->objectNameString == a_objectName && it->funcNameString == a_funcName)
+                {
+                    m_jsFuncCallbackInfoCache.erase(it);
+                }
+            }
+
+            if (!m_jsFuncStorage->RemoveFunctionCallback(a_objectName, a_funcName))
+            {
+                m_jsFuncRemoveCache.push_back({a_objectName, a_funcName});
+            }
+            return;
+        }
+
+        RemoveFunctionCallbackAndSendMessage(a_objectName, a_funcName);
+    }
+
+    void __cdecl DefaultBrowser::RemoveFunctionCallback(const NL::JS::JSFuncInfo& a_callbackInfo)
+    {
+        RemoveFunctionCallback(a_callbackInfo.objectName, a_callbackInfo.funcName);
+    }
+
 #pragma endregion
 
 #pragma region RE::MenuEventHandler
diff --git a/src/UIPlatform/CEF/DefaultBrowser.h b/src/UIPlatform/CEF/DefaultBrowser.h
index de43204..e4868e9 100644
--- a/src/UIPlatform/CEF/DefaultBrowser.h
+++ b/src/UIPlatform/CEF/DefaultBrowser.h
@@ -35,7 +35,8 @@ namespace NL::CEF
         std::vector<std::tuple<std::string, std::string>> m_jsExecCache;
 
         // JS function callback
-        std::vector<NL::JS::JSFuncInfoString> m_jsFuncCallbackInfoCache;
+        std::list<NL::JS::JSFuncInfoString> m_jsFuncCallbackInfoCache;
+        std::list<std::tuple<std::string, std::string>> m_jsFuncRemoveCache;
 
         RE::CursorMenu* m_cursorMenu = nullptr;
         float& m_currentMousePosX = RE::MenuCursor::GetSingleton()->cursorPosX;
@@ -77,6 +78,7 @@ namespace NL::CEF
         bool IsReadyAndLog();
 
         void AddFunctionCallbackAndSendMessage(const NL::JS::JSFuncInfo& a_callbackInfo);
+        void RemoveFunctionCallbackAndSendMessage(const char* a_objectName, const char* a_funcName);
 
         // IBrowser
         bool __cdecl IsBrowserReady() override;
@@ -93,6 +95,8 @@ namespace NL::CEF
         void __cdecl LoadBrowserURL(const char* a_url, bool a_clearJSFunctions = true) override;
         void __cdecl ExecuteJavaScript(const char* a_script, const char* a_scriptUrl = JS_EXECUTE_SCRIPT_URL) override;
         void __cdecl AddFunctionCallback(const NL::JS::JSFuncInfo& a_callbackInfo) override;
+        void __cdecl RemoveFunctionCallback(const char* a_objectName, const char* a_funcName) override;
+        void __cdecl RemoveFunctionCallback(const NL::JS::JSFuncInfo& a_callbackInfo) override;
 
         // RE::MenuEventHandler
         bool CanProcess(RE::InputEvent* a_event) override;
diff --git a/src/UIPlatform/NirnLabUIPlatformAPI/IBrowser.h b/src/UIPlatform/NirnLabUIPlatformAPI/IBrowser.h
index 39850e9..28a8187 100644
--- a/src/UIPlatform/NirnLabUIPlatformAPI/IBrowser.h
+++ b/src/UIPlatform/NirnLabUIPlatformAPI/IBrowser.h
@@ -53,5 +53,7 @@ namespace NL::CEF
         virtual void __cdecl LoadBrowserURL(const char* a_url, bool a_clearJSFunctions = true) = 0;
         virtual void __cdecl ExecuteJavaScript(const char* a_script, const char* a_scriptUrl = JS_EXECUTE_SCRIPT_URL) = 0;
         virtual void __cdecl AddFunctionCallback(const NL::JS::JSFuncInfo& a_callbackInfo) = 0;
+        virtual void __cdecl RemoveFunctionCallback(const char* a_objectName, const char* a_funcName) = 0;
+        virtual void __cdecl RemoveFunctionCallback(const NL::JS::JSFuncInfo& a_callbackInfo) = 0;
     };
 }
diff --git a/src/UIPlatformTest/NirnLabUIPlatformAPI/IBrowser.h b/src/UIPlatformTest/NirnLabUIPlatformAPI/IBrowser.h
index 39850e9..28a8187 100644
--- a/src/UIPlatformTest/NirnLabUIPlatformAPI/IBrowser.h
+++ b/src/UIPlatformTest/NirnLabUIPlatformAPI/IBrowser.h
@@ -53,5 +53,7 @@ namespace NL::CEF
         virtual void __cdecl LoadBrowserURL(const char* a_url, bool a_clearJSFunctions = true) = 0;
         virtual void __cdecl ExecuteJavaScript(const char* a_script, const char* a_scriptUrl = JS_EXECUTE_SCRIPT_URL) = 0;
         virtual void __cdecl AddFunctionCallback(const NL::JS::JSFuncInfo& a_callbackInfo) = 0;
+        virtual void __cdecl RemoveFunctionCallback(const char* a_objectName, const char* a_funcName) = 0;
+        virtual void __cdecl RemoveFunctionCallback(const NL::JS::JSFuncInfo& a_callbackInfo) = 0;
     };
 }
diff --git a/src/UIPlatformTest/TestCases/LocalTestPage.cpp b/src/UIPlatformTest/TestCases/LocalTestPage.cpp
index 05aea88..a083b98 100644
--- a/src/UIPlatformTest/TestCases/LocalTestPage.cpp
+++ b/src/UIPlatformTest/TestCases/LocalTestPage.cpp
@@ -6,7 +6,7 @@ namespace NL::UI::TestCase
     {
         // func1
         auto func1 = new JS::JSFuncInfo();
-        func1->objectName = "window";
+        func1->objectName = "NL";
         func1->funcName = "func1";
         func1->callbackData.executeInGameThread = false;
         func1->callbackData.callback = [](const char** a_args, int a_argsCount) {
@@ -21,7 +21,7 @@ namespace NL::UI::TestCase
 
         // func2
         auto func2 = new JS::JSFuncInfo();
-        func2->objectName = "window";
+        func2->objectName = "NL";
         func2->funcName = "func2";
         func2->callbackData.executeInGameThread = true;
         func2->callbackData.callback = [](const char** a_args, int a_argsCount) {
@@ -58,10 +58,10 @@ namespace NL::UI::TestCase
         m_pingThread = std::make_shared<std::thread>([=]() {
             std::this_thread::sleep_for(12s);
 
-            m_browser->LoadBrowserURL("file:///_testLocalPage.html", false);
+            m_browser->LoadBrowserURL("file:///_testLocalPage.html", true);
 
             // func1
-            JS::JSFuncInfoString strFunInfo("window", "func1");
+            JS::JSFuncInfoString strFunInfo("NL", "func1");
             strFunInfo.callbackData.executeInGameThread = false;
             strFunInfo.callbackData.callback = [](const char** a_args, int a_argsCount) {
                 std::string argsStr = "";
@@ -73,17 +73,18 @@ namespace NL::UI::TestCase
                 spdlog::info("func1__ callback. params: {}", argsStr);
             };
             m_browser->AddFunctionCallback(strFunInfo);
-
+            
             while (!m_browser->IsPageLoaded())
             {
                 std::this_thread::sleep_for(100ms);
             }
+            //m_browser->RemoveFunctionCallback(strFunInfo.objectName, strFunInfo.funcName);
 
             int i = 0;
             while (i < 10)
             {
                 std::this_thread::sleep_for(1s);
-                m_browser->ExecuteJavaScript(fmt::format("window.func1({})", std::to_string(++i).c_str()).c_str());
+                m_browser->ExecuteJavaScript(fmt::format("NL.func1({})", std::to_string(++i).c_str()).c_str());
             }
 
             a_api->ReleaseBrowserHandle(m_browserHandle);