Slowed & Reverb

Name: Slowed & Reverb
Author: Ozan Sahin

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

Overview

Firefox Add-ons Store

Daily users

4 ▲ 1

Data as of 2026-09-08

Version:

1.0.0

Last updated: 2026-08-14

Features & Capabilities

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

Speed from 0.5x to 1.5x, with tape-style pitch shifting or optional original-pitch preservation
Reverb, three-band EQ, echo, pan, stereo width, and saturation
Slowed + Reverb and Nightcore presets
Custom presets, optional keyboard shortcuts, and four popup themes
Per-tab settings that restore after navigation or reload

Supported sites

YouTube™
YouTube Music™
Spotify web player

Spotify support is optional. Access to open.spotify.com 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 & Reverb has no analytics, telemetry, advertising, remote code, or extension-originated network requests.

Notes

A newly opened tab starts with effects off.
YouTube live streams support audio filters but not speed changes.
Firefox Android is not supported in version 1.0.0.

Slowed & 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.

User Growth & Download Statistics

Add-on

By:

Ozan Sahin

Daily users:

4 1

Version:

1.0.0 Last updated: 2026-08-14

Version code:

6407702

Creation date:

2026-08-11

Firefox add-on GUID:

slowed-reverb@sahinozan

Firefox add-on numeric ID:

3052514

Weekly download count:

Firefox on Android:

Risk:

Permissions:

Size:

55.71KB

Email:

sl*****@proton.me

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-09-08

Compare stats and ranking:

Ranking

# 48,195 ▲ 5,186

Other rankings

#34 in slow keyword 6 ▲ 2

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Ozan Sahin

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/slowed-reverb/

Email:

sl*****@proton.me

Website:

https://github.com/sahinozan/slowed-and-reverb/issues

Is Slowed & Reverb Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Slowed & Reverb does not require any sensitive permissions.

Risk impact analysis details

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Slowed & Reverb is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

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