Firefox add-on that allows MP3 conversion for free, video conversion, audio extraction from video, video and audio combining, multiple videos combined into one, maximum volume adjustment, video resolution change, video rotation, sound
How to convert any video (or song) into an MP3 | Cult of Mac
Convert online videos to MP3 from over 1000 supported sites without any limits. Unlimited video size and download speed. | Video to mp3 converter, Video, Converter