VMWare Fusion & shared folder with Linux guest

Under guest (Linux) identify uid and gid:
guest$ id
uid=500(username) gid=500(groupname) groups=500
then adjust the /etc/fstab file accordingly, in the block added by VMWare software:
old: .host:/ /mnt/hgfs vmhgfs defaults,ttl=5 0 0
new: .host:/ /mnt/hgfs vmhgfs defaults,ttl=5,uid=500,gid=500 0 0
lastly umount and remount hgfs:
guest$ sudo umount /mnt/hgfs
guest$ sudo mount /mnt/hgfs

kmail, firefox and macosx

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 [...]