Stereo Check von Navin

A simple Firefox extension to test whether you're wearing your headphones or earphones correctly. Verify that the left channel is in your left ear and the right channel is in your right ear.

Features

• Test left and right audio channels independently
• Generates a clean 440Hz (default) sine wave tone
• Visual feedback showing which channel is playing
• Simple, intuitive interface
• Interface supports both light and dark themes
• Settings view allows setting theme, volume, and frequency
  of the tone
• Built with React, TypeScript, and Vite

Source:

https://github.com/navin09/fx-stereo-check