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Preview of ThunderFox - Loudness Normalizer

ThunderFox - Loudness Normalizer by 7nihilate

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

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About this extension
ThunderFox is a lightweight Firefox extension that applies loudness maximization to media elements (audio and video) on web pages.

This add-on may not work on websites that stream DRM controlled content.

Features:
- Multiband processing (Low / Mid / High) using linear-phase FIR bandpasses when supported, with biquad fallbacks.
- Parallel upward and downward compression inside each band to both raise low-level content and control peaks.
- Global highpass filter (user-toggleable) placed after band summing and before the limiter to remove sub-bass frequencies if desired.
- Final limiter with threshold control and automatic gain compensation so lowering the threshold increases output gain to approach 0 dB peaks.
- Persistent controls in the popup: enable/disable processing, toggle highpass, and adjust limiter threshold.
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Permissions and data

Required permissions:

  • Access your data for all websites

Optional permissions:

  • Access your data for all websites
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More information
Version
0.1.0
Size
29.95 KB
Last updated
4 days ago (Oct 27, 2025)
Related Categories
  • Photos, Music & Videos
  • Social & Communication
  • Games & Entertainment
License
GNU Affero General Public License v3.0 only
Version History
  • See all versions
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