Booster Volume

Firefox Volume Booster

Firefox does not implement audio capture in its screen-sharing API, so no web page can boost audio from another Firefox tab. There is no flag or about:config entry that changes this. What does work is boosting files you load directly, which Firefox supports fully through the Web Audio API.

Boost a file in Firefox

Firefox volume boosterFull Web Audio processing for files you load. Tab capture is unavailable in Firefox.

Drop an audio or video file here, or choose one. It is processed on your device and never uploaded.

Processed on your device — nothing is uploaded. Loud audio can damage hearing: lower your system volume before boosting, then raise it gradually.

Why tab capture is missing

Firefox supports screen and window sharing, but its implementation does not offer an audio track for the shared surface. Chromium browsers added this for tab sharing specifically; Firefox has not followed. The result is that a page requesting shared audio in Firefox either receives no audio track or is refused outright.

This is a genuine platform limitation rather than something a website can work around. If you need to boost audio playing on a website in Firefox, the practical options are a Firefox extension with the necessary permissions, or a system-level solution such as Windows Loudness Equalization.

Firefox settings that affect volume

Per-tab mute
Click the speaker icon on a tab, or right-click and choose Unmute Tab.
Autoplay blocking
Settings › Privacy & Security › Permissions › Autoplay. Blocking audio here prevents playback starting, which can read as silence.
System app volume
On Windows, Firefox has its own volume mixer level, entirely separate from the master slider.
Media playback backend
On Linux, a misconfigured PulseAudio or PipeWire routing can cap Firefox output. Check your system mixer for a per-application stream.

Frequently asked questions

Can a Firefox extension boost volume?

Yes. Extensions have access to APIs that web pages do not, and several volume-boosting add-ons exist. As with any extension, look closely at the permissions it requests relative to what boosting audio actually needs.

Is Firefox audio quieter than Chrome?

Not inherently. Differences almost always trace to per-application volume in the operating system rather than to the browser itself.

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