Check userAgent before running electron init

src/Electron.tsx

@@ -417,11 +417,15 @@ function calculateAchievements(): void {
 }
 
 export function initElectron(): void {
+  const userAgent = navigator.userAgent.toLowerCase();
+  if (userAgent.indexOf(' electron/') > -1) {
+    // Electron-specific code
     setAchievements([]);
     initWebserver();
     setInterval(calculateAchievements, 5000);
     initAppNotifier();
   }
+}
 
 function initWebserver(): void {
   (document as any).saveFile = function (filename: string, code: string): string {