# Slowed & Reverb

> Real-time speed, reverb, EQ, and stereo effects for YouTube™, YouTube Music™, and Spotify. Processing stays on your device.

Canonical page: [https://chrome-stats.com/d/slowed-reverb](https://chrome-stats.com/d/slowed-reverb)

## Overview

- **ID:** `slowed-reverb`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Ozan Sahin
- **Category:** photos-music-videos
- **Daily users:** 4
- **Weekly downloads:** 5
- **Version:** 1.0.0
- **Last updated:** 2026-08-14
- **First published:** 2026-08-11
- **Size:** 56 KB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/slowed-reverb/)
- **Website:** [https://github.com/sahinozan/slowed-and-reverb/issues](https://github.com/sahinozan/slowed-and-reverb/issues)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/slowed-reverb/privacy/](https://addons.mozilla.org/firefox/addon/slowed-reverb/privacy/)

## Description

Change how supported music and video sounds in real time. Open the toolbar popup and adjust the audio while it plays. The extension does not download media or send audio to the developer.

Features
<ul><li>Speed from 0.5x to 1.5x, with tape-style pitch shifting or optional original-pitch preservation</li><li>Reverb, three-band EQ, echo, pan, stereo width, and saturation</li><li>Slowed + Reverb and Nightcore presets</li><li>Custom presets, optional keyboard shortcuts, and four popup themes</li><li>Per-tab settings that restore after navigation or reload</li></ul>
Supported sites
<ul><li>YouTube™</li><li>YouTube Music™</li><li>Spotify web player</li></ul>
Spotify support is optional. Access to <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/8009c66002a43d7cfd1332cd215120bef542b9f2dc35c13541ec9ef2a67a9903/http%3A//open.spotify.com" rel="nofollow">open.spotify.com</a> is requested only when you choose to enable it and can be revoked in browser extension settings. Other sites are left unchanged.

On Firefox, restoring effects after a reload requires optional access to the exact YouTube or YouTube Music site being used. That access is requested on first use, not during installation, and can be revoked at any time.

Audio processing happens locally in the browser. Slowed &amp; Reverb has no analytics, telemetry, advertising, remote code, or extension-originated network requests.

Notes
<ul><li>A newly opened tab starts with effects off.</li><li>YouTube live streams support audio filters but not speed changes.</li><li>Firefox Android is not supported in version 1.0.0.</li></ul>
Slowed &amp; Reverb is independently developed and is not affiliated with, endorsed by, or sponsored by Google or Spotify.

YouTube and YouTube Music are trademarks of Google LLC. Spotify is a trademark of Spotify AB.

## Rankings

- #48,304 — Overall
- #36 — slow

## Permissions and access

### Permissions

- `activeTab`
- `scripting`
- `storage`

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Slowed + Reverb & Pitch](https://chrome-stats.com/d/slowed-reverb-pitch) — 4 users
- [Slowverb](https://chrome-stats.com/d/slowverb) — 33 users
- [SlowedAndReverb.Studio](https://chrome-stats.com/d/slowedandreverb-studio) — 1,039 users, 4.50 / 5
- [Slow and Reverb for YouTube](https://chrome-stats.com/d/slow-and-reverb-for-youtube) — 3 users
- [Audio Effects Studio](https://chrome-stats.com/d/audio-effects-studio) — 54 users, 5.00 / 5
- [Reverbify - Remix Spotify Music](https://chrome-stats.com/d/reverbify-remix-spotify-music) — 117 users, 5.00 / 5
- [Audio FX](https://chrome-stats.com/d/audio-fx) — 60 users, 5.00 / 5
- [YouTube Slow and Reverb](https://chrome-stats.com/d/youtube-slow-and-reverb) — 303 users, 4.92 / 5
- [Slow & Reverb for Youtube](https://chrome-stats.com/d/slow-reverb-for-youtube) — 18 users
- [Tune Shifter](https://chrome-stats.com/d/tune-shifter) — 5 users, 5.00 / 5
- [Transpose / Speed / Reverb / Loop - Shifter](https://chrome-stats.com/d/transpose-shifter) — 374 users, 5.00 / 5
- [Transpose / Speed / Reverb / Loop - Shifter](https://chrome-stats.com/d/transpose-pitch-shifter) — 374 users, 5.00 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/slowed-reverb)