Firefox 153.0.1 + Spotify and YouTube Web Player causes Bluetooth audio devices to disconnect when changing tracks

'''Summary''' When using the Spotify Web Player in Firefox, Bluetooth audio devices disconnect whenever the playback position changes (automatic track transition or manual seek). The issue does not occur in Google Chrome or other media applications. '''Environment''' Firefox Version: 153.0.1 (64-bit, Release) Operating System: Windows 11 Home 25H2 (Build 26200) Laptop: Lenovo ThinkPad E14 Gen 5 (AMD Ryzen 5 7530U) Audio Backend: WASAPI Graphics: WebRender Bluetooth Device Tested: * Google Nest Mini (Bluetooth mode) * boAt Stone 1010 (same behavior) '''Problem Description''' Spotify Web Player starts playing normally through a Bluetooth audio device. However, whenever: * the current song automatically changes to the next track, or * I manually seek within a song (forward or backward), or * I manually switch to another track, '''the following happens:''' 1. Spotify continues playing (the progress timer keeps increasing). 2. No audio is heard after the track transition or seek. 3. The Bluetooth device remains connected for approximately 15–18 seconds without receiving audio. 4. After about 15–18 seconds, the Bluetooth device disconnects automatically from Windows. The Bluetooth disconnection appears to be a consequence of Firefox no longer sending audio after the media transition. '''Expected Behavior''' Audio should continue immediately after: * automatic track changes, * manual seeking, * or switching tracks, without interrupting the Bluetooth audio stream or disconnecting the Bluetooth device. '''Actual Behavior''' * Spotify playback timer continues. * No audio is produced. * Bluetooth audio stream becomes silent. * Approximately 15–18 seconds later, the Bluetooth device disconnects. '''What I Tested''' Works correctly * Spotify Web Player in Google Chrome * VLC Media Player * General Windows audio playback Fails consistently * Spotify Web Player and youTube web in Firefox 153.0.1 The issue is reproducible with multiple Bluetooth audio devices, indicating it is not specific to a single speaker or headset. '''Additional Observations''' * Opening other Firefox tabs or using other applications does '''not '''disconnect Bluetooth. * The issue only occurs when Spotify and YouTube changes its audio stream (track transition or seeking). * Bluetooth remains stable while audio is continuously playing. * The disconnect only occurs after Firefox stops outputting audio during a track change. '''Firefox Information''' * Audio Backend: WASAPI * Graphics Compositing: WebRender * Hardware acceleration available * No crashes reported '''Steps to Reproduce''' 1. Connect a Bluetooth speaker or headset to Windows. 2. Open Firefox. 3. Open Spotify Web Player. 4. Start playing music. 5. Wait for the next song to start automatically, or manually seek forward/backward or switch tracks. 6. Observe that audio disappears immediately. 7. After approximately 15–18 seconds, the Bluetooth device disconnects automatically. '''Frequency''' 100% reproducible on my system.