diff --git a/sw.js b/sw.js
index 38aa7e6..768fed9 100755
--- a/sw.js
+++ b/sw.js
@@ -50,6 +50,9 @@ self.addEventListener('activate', event => {
 self.addEventListener('fetch', event => {
 	const url = new URL(event.request.url);
 
+	// Nur http/https cachen - chrome-extension:// etc. überspringen
+	if (url.protocol !== 'http:' && url.protocol !== 'https:') return;
+
 	// PWA Auth Endpoints - immer Netzwerk
 	if (url.pathname.includes('pwa_auth.php')) {
 		event.respondWith(fetch(event.request));