OnlyMP3 is a subscription-based add-on for Firefox designed for seamless conversion of YouTube videos to MP3 audio files. Users can easily initiate the conversion process by clicking the Cloud Download icon while watching a video. This convenient feature opens a popup with a dedicated button for converting the video, streamlining the user experience.

Once the conversion process begins, a new tab is opened automatically to facilitate the conversion. Users can monitor the progress, and once completed, they can effortlessly download the MP3 file by clicking the Download button. This efficient tool caters to multimedia enthusiasts looking to extract audio from their favorite YouTube content.