330CUT_FF - LowCut Audio Toggle Extension

A Firefox browser extension that provides a toolbar toggle to apply a 330 Hz low-cut (high-pass) filter to audio and video content on web pages.

Features

• Real-time Audio Processing: Applies a 330 Hz high-pass filter to reduce low-frequency bass
• Simple Toggle: One-click toolbar button to enable/disable the filter
• State Persistence: Remembers your preference across browser sessions
• Universal Compatibility: Works on all websites with HTML5 audio/video
• Fallback Support: Handles CORS-restricted media via tab capture API

Installation

From Source

1. Clone this repository:

   git clone https://github.com/yourusername/330CUT_FF.git
   cd 330CUT_FF

2. Install as temporary add-on in Firefox:

   • Open Firefox and navigate to about:debugging#/runtime/this-firefox
   • Click Load Temporary Add-on…
   • Select extension/manifest.json from the project

From Firefox Add-ons (Coming Soon)

The extension will be published to the Firefox Add-ons store for easy installation.

Usage

1. Navigate to any webpage with audio or video content (YouTube, Bandcamp, etc.)
2. Click the LowCut toolbar icon to toggle the filter:
   • OFF (default): Normal audio playback
   • ON: Bass frequencies below 330 Hz are reduced
3. The icon and tooltip will update to show the current state

Technical Details

• Filter Type: High-pass (low-cut) at 330 Hz
• Q Factor: 0.707 (Butterworth response)
• Manifest Version: 2 (Firefox ESR compatible)
• Permissions: tabs, storage, activeTab

Development

Project Structure

330CUT_FF/
├── extension/          # Extension source code
│   ├── manifest.json   # Extension manifest
│   ├── background.js   # Background script
│   ├── content/        # Content scripts
│   └── icons/          # Extension icons
├── docs/               # Documentation
└── README.md           # This file

Building

No build process required - the extension uses plain JavaScript.

Testing

1. Load as temporary add-on (see Installation)
2. Test on media sites like YouTube or Bandcamp
3. Verify toolbar icon updates correctly
4. Check that audio filtering is applied/removed

Contributing

Contributions are welcome! Please feel free to submit issues and pull requests.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Author

Andreas Michael Fleckl - Homepage

Acknowledgments

• Uses the Web Audio API for real-time audio processing
• Icon design inspired by audio filter visualizations