Who should use StereoToMono?

StereoToMono is a consumer product built for firefox users who need mono audio playback.

Does StereoToMono have a free plan?

Yes — StereoToMono is free to use.

What platforms does StereoToMono run on?

StereoToMono runs on the web and embeddable surfaces.

Is StereoToMono still maintained?

Unverified. StereoToMono has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

Who develops StereoToMono?

StereoToMono is developed by no9.

When did StereoToMono launch?

StereoToMono first shipped in 2022.

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StereoToMono

Name: StereoToMono
Author: no9

mozilla.orgAudio editors & converters

StereoToMono is a Firefox extension that combines left and right audio channels into mono output for videos and audio elements on web pages. Users can activate it with one click and optionally keep the setting for the current browser session.

FreeWebEmbeddable

Visit mozilla.org

Overview

7 features

StereoToMono sits in PulseGate's Audio editors & converters category. It focuses on hearing stereo audio clearly through one or both speakers when channels are unbalanced or phase issues affect playback. StereoToMono is a consumer product aimed at firefox users who need mono audio playback. It is available for free. StereoToMono is available on the web and embeddable surfaces.

no9 builds and maintains StereoToMono, and it first shipped in 2022. Among its 7 catalogued features are stereo mixing, mono output, and one-click activation. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Stereo mixing
Mono output
One-click activation
Video support
Audio support
Session preference
Channel balancing

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 18:53 UTC
StereoToMono verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about StereoToMono

What is StereoToMono?: StereoToMono focuses on hearing stereo audio clearly through one or both speakers when channels are unbalanced or phase issues affect playback. It is catalogued under Audio editors & converters on PulseGate.
Who should use StereoToMono?: StereoToMono is a consumer product built for firefox users who need mono audio playback.
Does StereoToMono have a free plan?: Yes — StereoToMono is free to use.
What platforms does StereoToMono run on?: StereoToMono runs on the web and embeddable surfaces.
Is StereoToMono still maintained?: Unverified. StereoToMono has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
Who develops StereoToMono?: StereoToMono is developed by no9.
When did StereoToMono launch?: StereoToMono first shipped in 2022.
What languages does StereoToMono support?: The interface is available in 32 languages, including Czech, German, and Greek.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users who need mono audio playback
Model: B2C
Solves: Hearing stereo audio clearly through one or both speakers when channels are unbalanced or phase issues affect playback.

Registered as

Firefox Add-ons: stereotomono

Developer

no9

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
Last seen: 8 Sept 2026

Identity audit (13)

Slug: stereotomono-mozilla-org
Lifecycle state recorded: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 Sept 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 8 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/stereotomono

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