diff --git a/web/zebra-spaces.html b/web/zebra-spaces.html
index adf4e6b..a8f7798 100644
--- a/web/zebra-spaces.html
+++ b/web/zebra-spaces.html
@@ -3392,6 +3392,20 @@ function attachSfuTrack(uuid, stream){
    * AudioContext where <audio>.play() doesn't. */
   if (myRole === 'listener'){
     if (attachListenerStreamViaAudioContext(uuid, stream)){
+      /* If a stale-stream attempt earlier in this lifecycle left an
+       * <audio> fallback element in remoteAudio[uuid], the SFU's still-
+       * alive transceiver continues feeding RTP into it. Now that the
+       * worklet path is the live audio source, tear the <audio> element
+       * down so we don't play the same publisher twice — once via
+       * <audio> (~0.5s native jbuf = "early") and once via worklet (4s
+       * = "on time"). Fox 2026-06-05: "fxhp-android-firefox is also
+       * hearing two, one perfectly synced, other is not." */
+      const stale = remoteAudio.get(uuid);
+      if (stale){
+        try { stale.srcObject = null; stale.pause(); stale.remove(); } catch(_){}
+        remoteAudio.delete(uuid);
+        logLine('', 'detached stale <audio> fallback for '+uuid.slice(0,4));
+      }
       stopMeter(uuid); startMeter(uuid, stream);
       logLine('', 'sfu: receiving '+((members.get(uuid)||{}).handle || uuid)+' (audioctx 4s)');
       return;
@@ -3401,6 +3415,12 @@ function attachSfuTrack(uuid, stream){
   } else {
     /* speaker / cohost / host: smaller buffer, same path. */
     if (attachAudioStreamViaWorklet(uuid, stream, SPEAKER_PLAYOUT_DELAY_SEC)){
+      const stale = remoteAudio.get(uuid);
+      if (stale){
+        try { stale.srcObject = null; stale.pause(); stale.remove(); } catch(_){}
+        remoteAudio.delete(uuid);
+        logLine('', 'detached stale <audio> fallback for '+uuid.slice(0,4));
+      }
       stopMeter(uuid); startMeter(uuid, stream);
       logLine('', 'sfu: receiving '+((members.get(uuid)||{}).handle || uuid)+' (audioctx '+SPEAKER_PLAYOUT_DELAY_SEC+'s)');
       return;
@@ -7839,8 +7859,8 @@ logLine('', 'ready — pick a handle, type a rendezvous code, enter the space');
 
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