diff --git a/Extensions/BlockReplacePackets/src/main/java/extensions/blockreplacepackets/BlockAndReplacePackets.java b/Extensions/BlockReplacePackets/src/main/java/extensions/blockreplacepackets/BlockAndReplacePackets.java
index 0e7337c..1eda9b0 100644
--- a/Extensions/BlockReplacePackets/src/main/java/extensions/blockreplacepackets/BlockAndReplacePackets.java
+++ b/Extensions/BlockReplacePackets/src/main/java/extensions/blockreplacepackets/BlockAndReplacePackets.java
@@ -211,4 +211,9 @@ public class BlockAndReplacePackets extends ExtensionForm {
 
         clearInput();
     }
+
+    @Override
+    protected boolean canDelete() {
+        return false;
+    }
 }
diff --git a/G-Earth/src/main/java/gearth/extensions/Extension.java b/G-Earth/src/main/java/gearth/extensions/Extension.java
index aa88f63..f720a01 100644
--- a/G-Earth/src/main/java/gearth/extensions/Extension.java
+++ b/G-Earth/src/main/java/gearth/extensions/Extension.java
@@ -23,8 +23,8 @@ public abstract class Extension {
         void act(String[] args);
     }
 
-    protected static final boolean CANLEAVE = true;     // can you disconnect the ext
-    protected static final boolean CANDELETE = true;    // can you delete the ext (will be false for some built-in extensions)
+    protected boolean canLeave;     // can you disconnect the ext
+    protected boolean canDelete;    // can you delete the ext (will be false for some built-in extensions)
 
     private String[] args;
     private boolean isCorrupted = false;
@@ -53,6 +53,9 @@ public abstract class Extension {
      * @param args arguments
      */
     public Extension(String[] args) {
+        canLeave = canLeave();
+        canDelete = canDelete();
+
         //obtain port
         this.args = args;
 
@@ -126,8 +129,8 @@ public abstract class Extension {
                             .appendBoolean(file != null)
                             .appendString(file == null ? "": file)
                             .appendString(cookie == null ? "" : cookie)
-                            .appendBoolean(CANLEAVE)
-                            .appendBoolean(CANDELETE);
+                            .appendBoolean(canLeave)
+                            .appendBoolean(canDelete);
                     writeToStream(response.toBytes());
                 }
                 else if (packet.headerId() == Extensions.OUTGOING_MESSAGES_IDS.CONNECTIONSTART) {
@@ -348,6 +351,14 @@ public abstract class Extension {
      */
     protected void onEndConnection(){}
 
+    protected boolean canLeave() {
+        return true;
+    }
+
+    protected boolean canDelete() {
+        return true;
+    }
+
 
     ExtensionInfo getInfoAnnotations() {
         return getClass().getAnnotation(ExtensionInfo.class);
diff --git a/G-Earth/src/main/java/gearth/extensions/ExtensionForm.java b/G-Earth/src/main/java/gearth/extensions/ExtensionForm.java
index 4815416..e24a816 100644
--- a/G-Earth/src/main/java/gearth/extensions/ExtensionForm.java
+++ b/G-Earth/src/main/java/gearth/extensions/ExtensionForm.java
@@ -74,4 +74,12 @@ public abstract class ExtensionForm {
      * A connection with Habbo has ended
      */
     protected void onEndConnection(){}
+
+    protected boolean canLeave() {
+        return true;
+    }
+
+    protected boolean canDelete() {
+        return true;
+    }
 }
diff --git a/G-Earth/src/main/java/gearth/extensions/ExtensionFormLauncher.java b/G-Earth/src/main/java/gearth/extensions/ExtensionFormLauncher.java
index e380415..b0c7253 100644
--- a/G-Earth/src/main/java/gearth/extensions/ExtensionFormLauncher.java
+++ b/G-Earth/src/main/java/gearth/extensions/ExtensionFormLauncher.java
@@ -44,6 +44,16 @@ public class ExtensionFormLauncher extends Application{
             ExtensionInfo getInfoAnnotations() {
                 return extInfo;
             }
+
+            @Override
+            protected boolean canLeave() {
+                return extensionForm.canLeave();
+            }
+
+            @Override
+            protected boolean canDelete() {
+                return extensionForm.canDelete();
+            }
         };
         extensionForm.primaryStage = primaryStage;
         Thread t = new Thread(() -> {