Librezam is a powerful music recognition browser extension for Firefox that leverages the internal API of Shazam to identify songs playing in the current tab. It offers support for alternative backends like Audd and ACRCloud, allowing users to customize their experience based on specific needs. The extension is designed to function seamlessly across nearly all websites and boasts a user-friendly interface with minimal bugs. Unlike other similar tools, Librezam prioritizes user privacy by excluding telemetry unrelated to music recognition.

This open-source extension provides unique features such as history functionality, automatic retries, and microphone recognition modes. Users can easily switch between backends, with the Shazam backend requiring no API registration and offering unlimited access. The ACRCloud backend enhances functionality by allowing humming and cover song recognition, although it does require an API key. Overall, Librezam stands out for its flexibility, privacy-conscious design, and cross-browser compatibility.