How to open shoutcast radios in Deadbeef?
Inspired by this post
Install OpenWith addon in Firefox
Go to the addon's preferences and add DeaDBeeF (from usr/share/applications)
then just right click the internet radio link and open in DeadBeeF
That will send the link to an empty playlist called 'Default"
and from there it can be dragged/dropped to a separated playlist to be saved for future use.