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YouTube™ to MP3 – Get this Extension for 🦊 Firefox (en-US)
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Video DownloadHelper – Get this Extension for 🦊 Firefox (en-US)
Youtube mp3 & video downloader – Get this Extension for 🦊 Firefox (en-US)
YouTube Video and Audio Downloader', an extension for Firefox that allows you to download video and audio files from YouTube for free - GIGAZINE
