Yay It Works!! Rated 5 out of 5 stars

UPDATE: It works!!. The developer hit it right on the nail. Between the new Firefox menu button & me being used to finding addon's options by going going to "Extension" it never occurred to me to check under the Tool menu for the YoutubeMP3Podcaster addon options. Thank you very much Jeremy.
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I used to love this addons, best of its kind, no doubt. Now after the recent two updates converting to mp3 is very poor, lots of skips and electronic like pitches, very weird. I no longer see a way to access the addon options to calibrate the file quality [e.g. as shown on the preview images on this page] Please fix this.The one thing I'm glad to see gone is the animated image waving back at you. Please

This review is for a previous version of the add-on (2.7.1). 

Disable Volume Control

The problems your describing are usually caused by the volume control feature. On some PCs it breaks the MP3s. Go to Tools -> YoutubeMP3Podcaster -> Options and uncheck the box under Volume Control. Thanks!