diff --git a/frontend/src/index.jsx b/frontend/src/index.jsx
index c6aaa4d955..51b487dc41 100644
--- a/frontend/src/index.jsx
+++ b/frontend/src/index.jsx
@@ -14,6 +14,7 @@ import store from './store';
 import MetricsPoller from './metrics-poller';
 import App from './component/app';
 import ScrollToTop from './component/scroll-to-top';
+import { writeWarning } from './security-logger';
 
 let composeEnhancers;
 
@@ -21,6 +22,7 @@ if (process.env.NODE_ENV !== 'production' && window.__REDUX_DEVTOOLS_EXTENSION_C
     composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__;
 } else {
     composeEnhancers = compose;
+    writeWarning();
 }
 
 const unleashStore = createStore(store, composeEnhancers(applyMiddleware(thunkMiddleware)));
diff --git a/frontend/src/security-logger.js b/frontend/src/security-logger.js
new file mode 100644
index 0000000000..7f0197b956
--- /dev/null
+++ b/frontend/src/security-logger.js
@@ -0,0 +1,9 @@
+export const writeWarning = () => {
+    // eslint-disable-next-line no-console
+    console.log(
+        `%cThis is a warning!
+Please do not use any JavaScript using copy/paste
+from elsewhere on the web or any person.`,
+        'color:white;font-size: 1.8em;background:red'
+    );
+};