Save youtube videos in Chrome, Firefox and opera

1) Create a new bookmark and add this code in the address box.
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This code is for standard video quality

javascript:window.location.href = 'http://youtube.com/get_video?video_id=' + swfArgs['video_id'] + "&l=" + swfArgs['l'] + "&sk=" + swfArgs['sk'] + '&fmt_map' + swfArgs['fmt_map'] + '&t=' + swfArgs['t'];

This code is for HD video quality where available

javascript:window.location.href = 'http://youtube.com/get_video?video_id=' + swfArgs['video_id'] + "&fmt=22" + "&l=" + swfArgs['l'] + "&sk=" + swfArgs['sk'] + '&t=' + swfArgs['t'];
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2) Save the bookmark
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3) Open your favorite video in youtube and click the new bookmark button you just created. Voila! Now make sure you have an .flv player so you can play the Video.
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X) Convert the video to .mp3 with the "Convert FLV to MP3" program which can be found at: http://www.convertflvtomp3.com/
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Credits to Lawrence Albert, original code author