From ad67330d20adbed4a099c98fad989c075cc7ad3d Mon Sep 17 00:00:00 2001
From: Ricky Stretch <rick@stretchy.ca>
Date: Mon, 23 Mar 2026 17:29:57 -0400
Subject: [PATCH] update

---
 frontend/public/sw.js | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/frontend/public/sw.js b/frontend/public/sw.js
index 66efcf8..9ebbe2f 100644
--- a/frontend/public/sw.js
+++ b/frontend/public/sw.js
@@ -43,9 +43,14 @@ self.addEventListener('activate', (event) => {
 
 self.addEventListener('fetch', (event) => {
   const url = event.request.url;
-  if (url.includes('/api/') || url.includes('/socket.io/') || url.includes('/manifest.json')) {
-    return;
-  }
+
+  // Only intercept same-origin requests — never intercept cross-origin calls
+  // (Firebase API, Google CDN, socket.io CDN, etc.) or specific local paths.
+  // Intercepting cross-origin requests causes Firebase SDK calls to return
+  // cached HTML, producing "unsupported MIME type" errors and breaking FCM.
+  if (!url.startsWith(self.location.origin)) return;
+  if (url.includes('/api/') || url.includes('/socket.io/') || url.includes('/manifest.json')) return;
+
   event.respondWith(
     fetch(event.request).catch(() => caches.match(event.request))
   );