Add styled console warning

app/soapbox/containers/soapbox.js

@@ -150,6 +150,30 @@ class SoapboxMount extends React.PureComponent {
 
 export default class Soapbox extends React.PureComponent {
 
+  printConsoleWarning = () => {
+    /* eslint-disable no-console */
+    console.log('%cStop!', [
+      'color: #ff0000',
+      'display: block',
+      'font-family: system-ui, -apple-system, BlinkMacSystemFont, Roboto, Ubuntu, "Helvetica Neue", sans-serif',
+      'font-size: 50px',
+      'font-weight: 800',
+      'padding: 4px 0',
+    ].join(';'));
+    console.log('%cThis is a browser feature intended for developers. If someone told you to copy-paste something here it is a scam and will give them access to your account.', [
+      'color: #111111',
+      'display: block',
+      'font-family: system-ui, -apple-system, BlinkMacSystemFont, Roboto, Ubuntu, "Helvetica Neue", sans-serif',
+      'font-size: 18px',
+      'padding: 4px 0 16px',
+    ].join(';'));
+    /* eslint-enable no-console */
+  }
+
+  componentDidMount() {
+    this.printConsoleWarning();
+  }
+
   render() {
     return (
       <Provider store={store}>