diff --git a/script.js b/script.js
index 871caf6..d803097 100644
--- a/script.js
+++ b/script.js
@@ -2133,8 +2133,18 @@ function initListenerMode() {
 
     mediaSource.addEventListener('sourceopen', () => {
         console.log('📦 MediaSource opened');
+        const mimeType = 'audio/webm;codecs=opus';
+        
+        if (!MediaSource.isTypeSupported(mimeType)) {
+            console.error(`❌ Browser does not support ${mimeType}`);
+            const statusEl = document.getElementById('connection-status');
+            if (statusEl) statusEl.textContent = '❌ Error: Browser does not support WebM/Opus audio';
+            alert('Your browser does not support WebM/Opus audio format. Please try Chrome, Firefox, or Edge.');
+            return;
+        }
+
         try {
-            sourceBuffer = mediaSource.addSourceBuffer('audio/webm;codecs=opus');
+            sourceBuffer = mediaSource.addSourceBuffer(mimeType);
             sourceBuffer.mode = 'sequence';
 
             // Kick off first append if data is already in queue
@@ -2337,7 +2347,9 @@ async function enableListenerAudio() {
             // If no buffered data yet, wait a bit for it to arrive
             if (!hasBufferedData()) {
                 console.log('⏳ Waiting for audio data to buffer...');
-                if (audioText) audioText.textContent = 'WAITING FOR STREAM...';
+                if (audioText) {
+                    audioText.textContent = chunksReceived > 0 ? 'BUFFERING...' : 'WAITING FOR STREAM...';
+                }
 
                 // Wait up to 10 seconds for data to arrive (increased from 5)
                 const waitForData = new Promise((resolve) => {
@@ -2347,6 +2359,10 @@ async function enableListenerAudio() {
                     const checkInterval = setInterval(() => {
                         attempts++;
 
+                        if (audioText && chunksReceived > 0 && audioText.textContent === 'WAITING FOR STREAM...') {
+                            audioText.textContent = 'BUFFERING...';
+                        }
+
                         if (attempts % 10 === 0) { // Log every second
                             console.log(`⏱️ Attempt ${attempts}/${maxAttempts} - Buffered: ${window.listenerAudio.buffered.length}, ReadyState: ${window.listenerAudio.readyState}`);
                         }