diff --git a/Build.Counter b/Build.Counter
index bf6950a4..081da695 100644
--- a/Build.Counter
+++ b/Build.Counter
@@ -1 +1 @@
-3387
+3400
diff --git a/Qv2ray.pro b/Qv2ray.pro
index 17dfb93c..7630adb4 100644
--- a/Qv2ray.pro
+++ b/Qv2ray.pro
@@ -118,7 +118,7 @@ Qv2rayAddSource(components, plugins/toolbar, QvToolbar, cpp, hpp)
 #Qv2rayAddSource(components, plugins/toolbar, QvToolbar_win, cpp)
 Qv2rayAddSource(components, proxy, QvProxyConfigurator, cpp, hpp)
 Qv2rayAddSource(components, tcping, QvTCPing, cpp, hpp)
-Qv2rayAddSource(core, config, ConfigBackend, cpp)
+Qv2rayAddSource(core, config, ConfigBackend, cpp, hpp)
 Qv2rayAddSource(core, config, ConfigUpgrade, cpp)
 Qv2rayAddSource(core, connection, ConnectionConfig_Convertion, cpp)
 Qv2rayAddSource(core, connection, ConnectionConfig_Generation, cpp)
diff --git a/src/base/Qv2rayBase.hpp b/src/base/Qv2rayBase.hpp
index b8334f3c..92602efd 100644
--- a/src/base/Qv2rayBase.hpp
+++ b/src/base/Qv2rayBase.hpp
@@ -1,6 +1,7 @@
 #pragma once
 #include <QtCore>
 #include <QtGui>
+#include <QApplication>
 #include <QMap>
 #include <vector>
 #include <algorithm>
@@ -96,4 +97,10 @@ namespace Qv2ray
 {
     // Extra header for QvConfigUpgrade.cpp
     QJsonObject UpgradeConfig(int fromVersion, int toVersion, QJsonObject root);
+
+    inline void ExitQv2ray()
+    {
+        isExiting = true;
+        QApplication::quit();
+    }
 }
diff --git a/src/common/CommandArgs.cpp b/src/common/CommandArgs.cpp
index c2504d6b..54081b41 100644
--- a/src/common/CommandArgs.cpp
+++ b/src/common/CommandArgs.cpp
@@ -1,5 +1,5 @@
 #include "CommandArgs.hpp"
-#include <QCommandLineParser>
+#include "base/Qv2rayBase.hpp"
 
 namespace Qv2ray::common
 {
diff --git a/src/common/CommandArgs.hpp b/src/common/CommandArgs.hpp
index 724741e4..72092b52 100644
--- a/src/common/CommandArgs.hpp
+++ b/src/common/CommandArgs.hpp
@@ -1,5 +1,7 @@
 #pragma once
-#include "base/Qv2rayBase.hpp"
+
+#include <QCommandLineParser>
+
 namespace Qv2ray::common
 {
     enum CommandLineParseResult {
diff --git a/src/common/HTTPRequestHelper.hpp b/src/common/HTTPRequestHelper.hpp
index 271e1dc3..f67221dc 100644
--- a/src/common/HTTPRequestHelper.hpp
+++ b/src/common/HTTPRequestHelper.hpp
@@ -58,3 +58,5 @@ namespace Qv2ray::common
             QNetworkAccessManager accessManager;
     };
 }
+
+using namespace Qv2ray::common;
diff --git a/src/common/QvHelpers.cpp b/src/common/QvHelpers.cpp
index f9592b09..6b5076be 100644
--- a/src/common/QvHelpers.cpp
+++ b/src/common/QvHelpers.cpp
@@ -1,5 +1,4 @@
 #include "common/QvHelpers.hpp"
-#include "common/CommandArgs.hpp"
 #include <QQueue>
 
 namespace Qv2ray::common
@@ -191,16 +190,6 @@ namespace Qv2ray::common
         }
     }
 
-    void QFastAppendTextDocument(const QString &message, QTextDocument *doc)
-    {
-        QTextCursor cursor(doc);
-        cursor.movePosition(QTextCursor::End);
-        cursor.beginEditBlock();
-        cursor.insertBlock();
-        cursor.insertHtml(message);
-        cursor.endEditBlock();
-    }
-
     QStringList ConvertQStringList(const QList<string> &stdListString)
     {
         QStringList listQt;
diff --git a/src/common/QvHelpers.hpp b/src/common/QvHelpers.hpp
index f1a47d24..5b27cdb4 100644
--- a/src/common/QvHelpers.hpp
+++ b/src/common/QvHelpers.hpp
@@ -34,7 +34,6 @@ namespace Qv2ray::common
     //
     QString FormatBytes(long long bytes);
     void DeducePossibleFileName(const QString &baseDir, QString *fileName, const QString &extension);
-    void QFastAppendTextDocument(const QString &message, QTextDocument *doc);
     QStringList ConvertQStringList(const QList<string> &stdListString);
     std::list<string> ConvertStdStringList(const QStringList &qStringList);
     //
diff --git a/src/components/autolaunch/QvAutoLaunch.hpp b/src/components/autolaunch/QvAutoLaunch.hpp
index 4bb2f45b..1c9e6443 100644
--- a/src/components/autolaunch/QvAutoLaunch.hpp
+++ b/src/components/autolaunch/QvAutoLaunch.hpp
@@ -6,4 +6,5 @@ namespace Qv2ray::components::autolaunch
     void SetLaunchAtLoginStatus(bool enable);
 }
 
+using namespace Qv2ray::components;
 using namespace Qv2ray::components::autolaunch;
diff --git a/src/components/pac/QvPACHandler.cpp b/src/components/pac/QvPACHandler.cpp
index ac031d7f..f534e7b3 100644
--- a/src/components/pac/QvPACHandler.cpp
+++ b/src/components/pac/QvPACHandler.cpp
@@ -2,6 +2,7 @@
 #include "qhttprequest.h"
 #include "qhttpresponse.h"
 #include "core/CoreUtils.hpp"
+#include "common/QvHelpers.hpp"
 
 namespace Qv2ray::components::pac
 {
@@ -13,8 +14,13 @@ namespace Qv2ray::components::pac
     }
     PACServer::~PACServer()
     {
-        pacServer->close();
-        delete pacServer;
+        if (isStarted) {
+            pacServer->close();
+        }
+
+        if (pacServer != nullptr) {
+            delete pacServer;
+        }
     }
     void PACServer::SetProxyString(const QString &proxyString)
     {
diff --git a/src/components/pac/QvPACHandler.hpp b/src/components/pac/QvPACHandler.hpp
index 0faa3a6d..a2c3e787 100644
--- a/src/components/pac/QvPACHandler.hpp
+++ b/src/components/pac/QvPACHandler.hpp
@@ -27,4 +27,5 @@ namespace Qv2ray::components::pac
     };
 }
 
+using namespace Qv2ray::components;
 using namespace Qv2ray::components::pac;
diff --git a/src/components/plugins/toolbar/QvToolbar.hpp b/src/components/plugins/toolbar/QvToolbar.hpp
index cdf858b9..84e45967 100644
--- a/src/components/plugins/toolbar/QvToolbar.hpp
+++ b/src/components/plugins/toolbar/QvToolbar.hpp
@@ -51,5 +51,7 @@ namespace Qv2ray::components::plugins
         QString GetAnswerToRequest(const QString &pchRequest);
     }
 }
+
+using namespace Qv2ray::components;
 using namespace Qv2ray::components::plugins::Toolbar;
 
diff --git a/src/components/proxy/QvProxyConfigurator.hpp b/src/components/proxy/QvProxyConfigurator.hpp
index a4066648..82425be6 100644
--- a/src/components/proxy/QvProxyConfigurator.hpp
+++ b/src/components/proxy/QvProxyConfigurator.hpp
@@ -8,4 +8,5 @@ namespace Qv2ray::components::proxy
     bool SetSystemProxy(const QString &address, int port, bool usePAC);
 }
 
+using namespace Qv2ray::components;
 using namespace Qv2ray::components::proxy;
diff --git a/src/components/tcping/QvTCPing.hpp b/src/components/tcping/QvTCPing.hpp
index ce35aefc..8b6b1b1d 100644
--- a/src/components/tcping/QvTCPing.hpp
+++ b/src/components/tcping/QvTCPing.hpp
@@ -9,8 +9,7 @@
 #endif
 #include <sys/time.h>
 #include <unistd.h>
-#include "common/QvHelpers.hpp"
-
+#include "base/Qv2rayBase.hpp"
 
 namespace Qv2ray::components::tcping
 {
diff --git a/src/core/CoreUtils.cpp b/src/core/CoreUtils.cpp
index 2cd0d0a8..9503f709 100644
--- a/src/core/CoreUtils.cpp
+++ b/src/core/CoreUtils.cpp
@@ -1,42 +1,9 @@
 #include "CoreUtils.hpp"
+#include "common/QvHelpers.hpp"
 #include "QApplication"
 
 namespace Qv2ray::core
 {
-    void SaveGlobalConfig(Qv2rayConfig conf)
-    {
-        GlobalConfig = conf;
-        QFile config(QV2RAY_CONFIG_FILE);
-        QString str = StructToJsonString(conf);
-        StringToFile(&str, &config);
-    }
-
-    void SetConfigDirPath(const QString &path)
-    {
-        Qv2rayConfigPath = path;
-
-        if (!path.endsWith("/")) {
-            Qv2rayConfigPath += "/";
-        }
-    }
-
-    void LoadGlobalConfig()
-    {
-        QFile file(QV2RAY_CONFIG_FILE);
-        file.open(QFile::ReadOnly);
-        QTextStream stream(&file);
-        auto str = stream.readAll();
-        auto config = StructFromJsonString<Qv2rayConfig>(str);
-        SaveGlobalConfig(config);
-        file.close();
-    }
-
-    void ExitQv2ray()
-    {
-        isExiting = true;
-        QApplication::quit();
-    }
-
     tuple<QString, int, QString> GetConnectionInfo(const CONFIGROOT &root)
     {
         bool validOutboundFound = false;
@@ -63,7 +30,7 @@ namespace Qv2ray::core
         // Set initial values.
         *host = QObject::tr("N/A");
         *port = 0;
-        *protocol = out["protocol"].toString(QObject::tr("N/A"));
+        *protocol = out["protocol"].toString(QObject::tr("N/A")).toLower();
 
         if (*protocol == "vmess") {
             auto Server = StructFromJsonString<VMessServerObject>(JsonToString(out["settings"].toObject()["vnext"].toArray().first().toObject()));
diff --git a/src/core/CoreUtils.hpp b/src/core/CoreUtils.hpp
index 10b3d9c9..4b8e75ab 100644
--- a/src/core/CoreUtils.hpp
+++ b/src/core/CoreUtils.hpp
@@ -1,14 +1,10 @@
 #pragma once
 
 #include "base/Qv2rayBase.hpp"
-#include "common/QvHelpers.hpp"
+#include "core/config/ConfigBackend.hpp"
 
 namespace Qv2ray::core
 {
-    void SaveGlobalConfig(Qv2rayConfig conf);
-    void LoadGlobalConfig();
-    void SetConfigDirPath(const QString &path);
-    //
     inline QString getTag(const INBOUND &in)
     {
         return in["tag"].toString();
@@ -19,7 +15,11 @@ namespace Qv2ray::core
         return in["tag"].toString();
     }
 
-    void ExitQv2ray();
+    inline QString getTag(const RuleObject &in)
+    {
+        return in.QV2RAY_RULE_TAG;
+    }
+
     tuple<QString, int, QString> GetConnectionInfo(const CONFIGROOT &alias);
     bool GetOutboundData(const OUTBOUND &out, QString *host, int *port, QString *protocol);
 }
diff --git a/src/core/config/ConfigBackend.cpp b/src/core/config/ConfigBackend.cpp
index e69de29b..d22b4de2 100644
--- a/src/core/config/ConfigBackend.cpp
+++ b/src/core/config/ConfigBackend.cpp
@@ -0,0 +1,35 @@
+#include "ConfigBackend.hpp"
+#include "common/QvHelpers.hpp"
+
+namespace Qv2ray::core::config
+{
+    void SaveGlobalConfig(Qv2rayConfig conf)
+    {
+        GlobalConfig = conf;
+        QFile config(QV2RAY_CONFIG_FILE);
+        QString str = StructToJsonString(conf);
+        StringToFile(&str, &config);
+    }
+
+    void SetConfigDirPath(const QString &path)
+    {
+        Qv2rayConfigPath = path;
+
+        if (!path.endsWith("/")) {
+            Qv2rayConfigPath += "/";
+        }
+    }
+
+    void LoadGlobalConfig()
+    {
+        QFile file(QV2RAY_CONFIG_FILE);
+        file.open(QFile::ReadOnly);
+        QTextStream stream(&file);
+        auto str = stream.readAll();
+        auto config = StructFromJsonString<Qv2rayConfig>(str);
+        SaveGlobalConfig(config);
+        file.close();
+    }
+}
+
+using namespace Qv2ray::core::config;
diff --git a/src/core/config/ConfigBackend.hpp b/src/core/config/ConfigBackend.hpp
new file mode 100644
index 00000000..08f94a1a
--- /dev/null
+++ b/src/core/config/ConfigBackend.hpp
@@ -0,0 +1,11 @@
+#include "base/Qv2rayBase.hpp"
+
+namespace Qv2ray::core::config
+{
+    void SaveGlobalConfig(Qv2rayConfig conf);
+    void SetConfigDirPath(const QString &path);
+    void LoadGlobalConfig();
+}
+
+using namespace Qv2ray::core;
+using namespace Qv2ray::core::config;
diff --git a/src/core/connection/ConnectionConfigOperations.hpp b/src/core/connection/ConnectionConfigOperations.hpp
index 21b8ec62..bb56b024 100644
--- a/src/core/connection/ConnectionConfigOperations.hpp
+++ b/src/core/connection/ConnectionConfigOperations.hpp
@@ -71,5 +71,5 @@ namespace Qv2ray::core::connection
     }
 }
 
-
+using namespace Qv2ray::core;
 using namespace Qv2ray::core::connection;
diff --git a/src/core/kernel/QvKernelInteractions.cpp b/src/core/kernel/QvKernelInteractions.cpp
index be2f458c..b90943ae 100644
--- a/src/core/kernel/QvKernelInteractions.cpp
+++ b/src/core/kernel/QvKernelInteractions.cpp
@@ -1,6 +1,7 @@
 #include <QObject>
 #include <QWidget>
 #include <QDesktopServices>
+#include "common/QvHelpers.hpp"
 #include "QvKernelInteractions.hpp"
 #include "core/connection/ConnectionConfigOperations.hpp"
 
diff --git a/src/core/kernel/QvKernelInteractions.hpp b/src/core/kernel/QvKernelInteractions.hpp
index 09ed827f..43dd6919 100644
--- a/src/core/kernel/QvKernelInteractions.hpp
+++ b/src/core/kernel/QvKernelInteractions.hpp
@@ -1,6 +1,6 @@
 #pragma once
 #include <QProcess>
-#include "core/CoreUtils.hpp"
+#include "base/Qv2rayBase.hpp"
 #ifdef WITH_LIB_GRPCPP
 #include <grpc++/grpc++.h>
 #include "libs/gen/v2ray_api_commands.pb.h"
diff --git a/src/ui/editors/w_InboundEditor.cpp b/src/ui/editors/w_InboundEditor.cpp
index 23df9504..82683738 100644
--- a/src/ui/editors/w_InboundEditor.cpp
+++ b/src/ui/editors/w_InboundEditor.cpp
@@ -1,5 +1,6 @@
 #include "w_InboundEditor.hpp"
 #include "core/CoreUtils.hpp"
+#include "common/QvHelpers.hpp"
 #include "core/connection/ConnectionConfigOperations.hpp"
 
 static bool isLoading = false;
diff --git a/src/ui/w_PreferencesWindow.cpp b/src/ui/w_PreferencesWindow.cpp
index 0eb6d78b..3f427fba 100644
--- a/src/ui/w_PreferencesWindow.cpp
+++ b/src/ui/w_PreferencesWindow.cpp
@@ -5,7 +5,9 @@
 #include <QStyle>
 #include <QDesktopServices>
 
+#include "common/QvHelpers.hpp"
 #include "common/HTTPRequestHelper.hpp"
+#include "core/config/ConfigBackend.hpp"
 #include "core/kernel/QvKernelInteractions.hpp"
 #include "core/connection/ConnectionConfigOperations.hpp"
 #include "components/plugins/toolbar/QvToolbar.hpp"
@@ -26,7 +28,7 @@ PreferencesWindow::PreferencesWindow(QWidget *parent) : QDialog(parent),
     networkToolbarPage->setEnabled(StartupOption.enableToolbarPlguin);
 
     if (!StartupOption.enableToolbarPlguin) {
-        networkToolbarInfoLabel->setText(tr("Qv2ray Network Toolbar is disabled and still under test. Add --withNetworkToolbar to enable."));
+        networkToolbarInfoLabel->setText(tr("Qv2ray Network Toolbar is disabled and still under test. Add --withToolbarPlugin to enable."));
     }
 
     // We add locales
diff --git a/src/ui/w_PreferencesWindow.hpp b/src/ui/w_PreferencesWindow.hpp
index 6bcf0e1c..a21ec994 100644
--- a/src/ui/w_PreferencesWindow.hpp
+++ b/src/ui/w_PreferencesWindow.hpp
@@ -2,7 +2,7 @@
 
 #include <QDialog>
 #include <ui_w_PreferencesWindow.h>
-#include "common/QvHelpers.hpp"
+#include "base/Qv2rayBase.hpp"
 
 class PreferencesWindow : public QDialog, private Ui::PreferencesWindow
 {
diff --git a/src/ui/w_SubscriptionManager.cpp b/src/ui/w_SubscriptionManager.cpp
index 0bc2933d..d115cd70 100644
--- a/src/ui/w_SubscriptionManager.cpp
+++ b/src/ui/w_SubscriptionManager.cpp
@@ -1,4 +1,6 @@
 #include "w_SubscriptionManager.hpp"
+#include "common/QvHelpers.hpp"
+#include "core/CoreUtils.hpp"
 #include "core/connection/ConnectionConfigOperations.hpp"
 
 SubscribeEditor::SubscribeEditor(QWidget *parent) :
diff --git a/src/ui/w_SubscriptionManager.hpp b/src/ui/w_SubscriptionManager.hpp
index 47f91cf0..6552d9da 100644
--- a/src/ui/w_SubscriptionManager.hpp
+++ b/src/ui/w_SubscriptionManager.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <QDialog>
-#include "core/CoreUtils.hpp"
+#include "base/Qv2rayBase.hpp"
 #include "common/HTTPRequestHelper.hpp"
 
 #include "ui_w_SubscriptionManager.h"