wow found a solution.
I dont understand why I have to do that, but it seems firefox fucks up
some path or other variables and because of that it doesnt find the
standard server socket file so when I explizitly specifiy that in the
org-protocol.desktop file, it works:
[Desktop Entry]
Name=org-prot
I tried to setup here org-protocol with firefox, first the docu is very
old does refer to gnome 2:
http://orgmode.org/worg/org-contrib/org-protocol.html#sec-3-1
So after searching around I found a howto to make the protocol known by
apps with a desktop file and the command update-desktop-database
