Need to document how to configure firefox launching from within kmail, as none of the “obvious” (googled) options worked:

X11 –> terminal –> kcontrol –> KDE components –> Component chooser –> Web browser –> enable “in the following browser” and add this line:

open /Applications/Firefox.app

The problem is that the only answer having come up close to the above was indicating the line to be:

/Applications/Firefox.app/Contents/MacOS/firefox

recommendation from an old posting on the subject, but which option leads to a “complaint”, if firefox is already running: “A copy of firefox is already open …”