It gets an extra star simply for being able to find audio on sites that other add-ons fail to find any. That's the end of good things to say for me though.

This thing took over 10 minutes to encode a podcast on my 3950x 16 core CPU and locked up firefox *hard* the whole time it was doing it. That javascript lame implementation is just plain *horrendous*. Please just rework this thing into an audio downloader and let me encode things if I actually need to using real software.

+ Doesn't use external web sites to do the converting.
- VERY slow to convert (several minutes for a 3 min. file). Saturates computer's CPU and essentially blocks my browser from doing anything else while converting.
- Leaves a status bar on your display while converting. Nice to see what is happening but if you close it the conversion apparently stops.
- It is not clear which source file it is using. YT provides several quality. No point in using 320k encode for a 128k source file.
- Would prefer a variable bitrate encode option so it can optimize for audio source used.

Nice idea and handy but not practical for me. In less time than this tool takes to convert a single file I can use other tools to get a source file of know quality and generate an optimal vbr mp3.