Equalizer for YouTube is a Firefox add-on designed to enhance the audio quality of YouTube videos by allowing users to adjust the audio settings according to their preferences. This unofficial extension provides a simple and efficient way to modify the balance of frequency components in audio files while watching content on YouTube. It does not include a toolbar button, as the equalizer interface is integrated directly on the YouTube page, making it user-friendly and easy to access.

The add-on features 18 audio presets, enabling users to select from various styles such as pop, club, party, and soft rock dance. This customization enhances the listening experience for different types of content. The Equalizer for YouTube is specifically tailored for YouTube and any embedded videos, ensuring compatibility and ease of use for those looking to improve their audio experience without the need for extensive technical knowledge.