diff --git a/Browser.cs b/Browser.cs
index bcd49f13..d0007c9f 100644
--- a/Browser.cs
+++ b/Browser.cs
@@ -32,6 +32,7 @@ namespace VRCX
                 CamelCaseJavascriptNames = false
             };
             JavascriptObjectRepository.Register("VRCX", VRCX.Instance, true, options);
+            JavascriptObjectRepository.Register("SharedVariable", SharedVariable.Instance, true, options);
             JavascriptObjectRepository.Register("VRCXStorage", VRCXStorage.Instance, false, options);
             JavascriptObjectRepository.Register("SQLite", SQLite.Instance, true, options);
         }
diff --git a/MainForm.cs b/MainForm.cs
index 6d9a3792..00e136df 100644
--- a/MainForm.cs
+++ b/MainForm.cs
@@ -52,6 +52,7 @@ namespace VRCX
                 CamelCaseJavascriptNames = false
             };
             Browser.JavascriptObjectRepository.Register("VRCX", VRCX.Instance, true, options);
+            Browser.JavascriptObjectRepository.Register("SharedVariable", SharedVariable.Instance, true, options);
             Browser.JavascriptObjectRepository.Register("VRCXStorage", VRCXStorage.Instance, false, options);
             Browser.JavascriptObjectRepository.Register("SQLite", SQLite.Instance, true, options);
             Browser.JavascriptObjectRepository.Register("LogWatcher", LogWatcher.Instance, true, options);
diff --git a/SharedVariable.cs b/SharedVariable.cs
new file mode 100644
index 00000000..93010df6
--- /dev/null
+++ b/SharedVariable.cs
@@ -0,0 +1,88 @@
+// Copyright(c) 2020 pypy. All rights reserved.
+//
+// This work is licensed under the terms of the MIT license.
+// For a copy, see <https://opensource.org/licenses/MIT>.
+
+using System.Collections.Generic;
+using System.Threading;
+
+namespace VRCX
+{
+    public class SharedVariable
+    {
+        public static SharedVariable Instance { get; private set; }
+        private readonly ReaderWriterLockSlim m_MapLock;
+        private readonly Dictionary<string, string> m_Map;
+
+        static SharedVariable()
+        {
+            Instance = new SharedVariable();
+        }
+
+        public SharedVariable()
+        {
+            m_MapLock = new ReaderWriterLockSlim();
+            m_Map = new Dictionary<string, string>();
+        }
+
+        public void Clear()
+        {
+            m_MapLock.EnterWriteLock();
+            try
+            {
+                if (m_Map.Count > 0)
+                {
+                    m_Map.Clear();
+                }
+            }
+            finally
+            {
+                m_MapLock.ExitWriteLock();
+            }
+        }
+
+        public bool Remove(string key)
+        {
+            m_MapLock.EnterWriteLock();
+            try
+            {
+                return m_Map.Remove(key);
+            }
+            finally
+            {
+                m_MapLock.ExitWriteLock();
+            }
+        }
+
+        public string Get(string key)
+        {
+            m_MapLock.EnterReadLock();
+            try
+            {
+                if (m_Map.TryGetValue(key, out string value) == true)
+                {
+                    return value;
+                }
+            }
+            finally
+            {
+                m_MapLock.ExitReadLock();
+            }
+
+            return string.Empty;
+        }
+
+        public void Set(string key, string value)
+        {
+            m_MapLock.EnterWriteLock();
+            try
+            {
+                m_Map[key] = value;
+            }
+            finally
+            {
+                m_MapLock.ExitWriteLock();
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/VRCX.csproj b/VRCX.csproj
index e18ae069..bbd2864e 100644
--- a/VRCX.csproj
+++ b/VRCX.csproj
@@ -132,6 +132,7 @@
     <Compile Include="NoopDragHandler.cs" />
     <Compile Include="RenderHandler.cs" />
     <Compile Include="SQLite.cs" />
+    <Compile Include="SharedVariable.cs" />
     <Compile Include="VRForm.cs">
       <SubType>Form</SubType>
     </Compile>
diff --git a/VRForm.cs b/VRForm.cs
index 20807554..39b2552f 100644
--- a/VRForm.cs
+++ b/VRForm.cs
@@ -47,9 +47,11 @@ namespace VRCX
                 CamelCaseJavascriptNames = false
             };
             Browser1.JavascriptObjectRepository.Register("VRCX", VRCX.Instance, true, options);
+            Browser1.JavascriptObjectRepository.Register("SharedVariable", SharedVariable.Instance, true, options);
             Browser1.JavascriptObjectRepository.Register("VRCXStorage", VRCXStorage.Instance, false, options);
             Browser1.JavascriptObjectRepository.Register("SQLite", SQLite.Instance, true, options);
             Browser2.JavascriptObjectRepository.Register("VRCX", VRCX.Instance, true, options);
+            Browser2.JavascriptObjectRepository.Register("SharedVariable", SharedVariable.Instance, true, options);
             Browser2.JavascriptObjectRepository.Register("VRCXStorage", VRCXStorage.Instance, false, options);
             Browser2.JavascriptObjectRepository.Register("SQLite", SQLite.Instance, true, options);
             Browser1.IsBrowserInitializedChanged += (A, B) =>