# ThunderFox - Loudness Normalizer

> This add-on normalizes volume across media, making for a more enjoyable experience. It processes web audio with a multiband compressor EQ and limiter. Say goodbye to riding the volume knob when dialogue is too quiet and explosions are too loud.

Canonical page: [https://chrome-stats.com/d/thunderfox-loudness-normalizer](https://chrome-stats.com/d/thunderfox-loudness-normalizer)

## Overview

- **ID:** `thunderfox-loudness-normalizer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** 7nihilate
- **Category:** photos-music-videos,social-communication,games-entertainment
- **Daily users:** 200
- **Weekly downloads:** 24
- **Rating:** 4.43 / 5 (7 ratings)
- **Version:** 0.3.1
- **Last updated:** 2026-04-24
- **First published:** 2025-10-27
- **Size:** 35 KB
- **Data as of:** 2026-09-13
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/thunderfox-loudness-normalizer/)
- **Website:** [https://github.com/brettpreston/ThunderFox](https://github.com/brettpreston/ThunderFox)

## Description

ThunderFox is a lightweight extension that applies loudness normalization to media elements (audio and video) on web pages. It uses a multiband processing chain to raise quiet content and keep peaks in check, resulting in a more consistent listening experience.

Key features include multiband processing (Low, Mid, High) with FIR bandpasses when supported, an optional global highpass after band summing, and a final limiter with automatic gain compensation. The popup provides persistent controls to enable/disable processing, toggle highpass, and adjust the limiter threshold. Note: may not work on DRM-protected streams.

## Rankings

- #8,358 — Overall
- #71 — process
- #159 — increase
- #200 — foe
- #204 — limit

## Permissions and access

### Permissions

- `storage`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions 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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/thunderfox-loudness-normalizer)