First I admire what you do. Very impressive program. And support.
Trying to capture streaming audio from Safari
Mac Mini (Model identifier Macmini7,1
OSX 10.13.6
start Safari, go to page
start Audacity
start playing audio track
Audacity
Click RED dot record
Error Opening recording device
Error Code: 0 Success
The manual says
“this means there is a problem with your Audacity, operating system or sound device recording settings, where xxxx is replaced by a numeric code” Look up code, dead end.