Visit this for installation and usage: https://github.com/bhishanpdl/ALFRED/blob/master/Published_Workflows/Alfred_Youtube_Safari_MP3/README.md
This workflow downloads currently playing video in the first tab of Safari in youtube.org website into the Downloads folder as the mp3 format.
Due to the large size of binaries "youtube-dl" and "ffmpeg", I can not upload full workflow in Packal, however, we can download the complete workflow from github.
Otherwise, download them from their official website and put them in workflow and you are good to go.
Suggestion: Set up the hot key Cmd shift M
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