Firefox audio fades in instead of starting instantly
I just switched to a new PC (Windows 11) and when using Firefox to watch videos, the audio fades in briefly instead of starting instantly. This happens with youtube, prime video, netflix etc. I have tested in Edge and this does not occur. I am using a bluetooth headset. I haven't been able to find anything about this online so open to any help.
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Hi
Do you have a link to a video you can share where this is happening?
Do you have any add-ons installed in Firefox?
Welcome to Hncarey: This issue usually happens because of Firefox’s audio initialization delay with some Bluetooth audio drivers — especially when Windows puts the audio device in a low-power state until sound starts.
✅ Try These Fixes:
Disable “Bluetooth Audio Power Management” in Windows
Open Device Manager → Bluetooth → your headset device → Properties → Power Management tab
Uncheck “Allow the computer to turn off this device to save power.”
Restart your PC.
Change Firefox Audio Settings
In Firefox address bar, type:
about:config
Search for:
media.setsinkid.enabled
and make sure it’s true.
Also search for:
media.cubeb.output_voice_routing
and set it to false.
Restart Firefox.
Update or Re-pair Bluetooth Headset
Remove the device from Bluetooth Settings → Devices → Remove device, then reconnect.
Update your Bluetooth and sound drivers via Windows Update or your PC manufacturer’s site.
Optional workaround
Play a short silent audio clip (or keep a silent tab open) — this keeps the Bluetooth channel “awake,” preventing fade-in.
🎧 Why it happens: Firefox initializes the audio stream a fraction of a second later than Edge, and some Bluetooth devices fade in the first second of audio when waking up from idle mode.