diff --git a/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/extensiondetails/StoreExtensionDetailsItem.java b/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/extensiondetails/StoreExtensionDetailsItem.java
index 9364bd7..7d66ef7 100644
--- a/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/extensiondetails/StoreExtensionDetailsItem.java
+++ b/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/extensiondetails/StoreExtensionDetailsItem.java
@@ -94,6 +94,8 @@ public class StoreExtensionDetailsItem implements ContentItem {
                 .append("> Framework: ").append(storeExtension.getFramework().getFramework().getName()).append(" - v").append(storeExtension.getFramework().getVersion()).append("\n")
                 .append("> Systems: ").append(String.join(", ", storeExtension.getCompatibility().getSystems())).append("\n \n");
 
+        contentBuilder.append("*Compatible clients:* ").append(String.join(", ", storeExtension.getCompatibility().getClients())).append("\n\n");
+
         if (storeExtension.getFramework().getFramework().isInstallationRequired()) {
             contentBuilder.append("Warning: the framework requires --url:additional installations-")
                     .append(storeExtension.getFramework().getFramework().getInstallationInstructions()).append(" !\n");
diff --git a/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/installed/StoreExtensionInstalledItem.java b/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/installed/StoreExtensionInstalledItem.java
index dc917d1..d9c55dd 100644
--- a/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/installed/StoreExtensionInstalledItem.java
+++ b/G-Earth/src/main/java/gearth/services/internal_extensions/extensionstore/application/entities/installed/StoreExtensionInstalledItem.java
@@ -1,9 +1,13 @@
 package gearth.services.internal_extensions.extensionstore.application.entities.installed;
 
 import gearth.services.internal_extensions.extensionstore.GExtensionStore;
+import gearth.services.internal_extensions.extensionstore.application.GExtensionStoreController;
+import gearth.services.internal_extensions.extensionstore.application.WebUtils;
 import gearth.services.internal_extensions.extensionstore.application.entities.StoreExtensionItem;
 import gearth.services.internal_extensions.extensionstore.repository.models.StoreExtension;
 import gearth.services.internal_extensions.extensionstore.tools.InstalledExtension;
+import netscape.javascript.JSObject;
+import org.apache.maven.artifact.versioning.ComparableVersion;
 
 public class StoreExtensionInstalledItem extends StoreExtensionItem {
 
@@ -20,8 +24,13 @@ public class StoreExtensionInstalledItem extends StoreExtensionItem {
 
     @Override
     protected String displayColor(int i) {
-        return super.displayColor(i);
-        // todo color depending on if it needs an update
+        if (storeExtension != null) {
+            if (new ComparableVersion(this.installedExtension.getVersion()).compareTo(new ComparableVersion(storeExtension.getVersion())) < 0) {
+                return "item_orange";
+            }
+            return super.displayColor(i);
+        }
+        return "item_red";
     }
 
     @Override
@@ -33,9 +42,35 @@ public class StoreExtensionInstalledItem extends StoreExtensionItem {
     @Override
     public void addHtml(int i, GExtensionStore gExtensionStore) {
         if (this.storeExtension != null) {
-            super.addHtml(i, gExtensionStore /* add custom color here */);
+            super.addHtml(i, gExtensionStore);
         }
+        else {
 
-        //todo html when extension isn't in store
+            // display a red item that can't be clicked - to mark that this is no available extension
+            StringBuilder htmlBuilder = new StringBuilder()
+                    .append("<div class=\"overview_item ").append(displayColor(i)).append(" content_item\">")
+
+                    .append("<div class=\"overview_item_logo\">")
+                    .append("<img src=\"\" alt=\"\">")
+                    .append("</div>")
+
+                    .append("<div class=\"overview_item_info\">")
+                    .append("<div class=\"oii_name\">").append(WebUtils.escapeMessage(installedExtension.getName())).append("</div>")
+                    .append("<div class=\"oii_desc\">Not found in G-ExtensionStore</div>")
+                    .append("</div>")
+
+                    .append("<div class=\"overview_item_msgs\">")
+                    .append("<div class=\"oim_top\">").append("Version: ").append(displayVersion()).append("</div>")
+                    .append("<div class=\"oim_bottom\"></div>")
+                    .append("</div>")
+
+                    .append("</div>");
+
+            String extension = htmlBuilder.toString();
+            GExtensionStoreController controller = gExtensionStore.getController();
+
+            controller.getWebView().getEngine().executeScript("document.getElementById('" +
+                    controller.getContentItemsContainer() + "').innerHTML += '" + extension + "';");
+        }
     }
 }
diff --git a/G-Earth/src/main/resources/gearth/services/internal_extensions/extensionstore/application/webview/css/content.css b/G-Earth/src/main/resources/gearth/services/internal_extensions/extensionstore/application/webview/css/content.css
index 8f3bc2c..2859f52 100644
--- a/G-Earth/src/main/resources/gearth/services/internal_extensions/extensionstore/application/webview/css/content.css
+++ b/G-Earth/src/main/resources/gearth/services/internal_extensions/extensionstore/application/webview/css/content.css
@@ -34,6 +34,10 @@
     background-color: #b5e6f9;
 }
 
+.item_orange {
+    background-color: #ffcc80;
+}
+
 .item_grey {
     background-color: #aaaaaa;
 }