Same little worry as Linas
On a Debian Stretch 9.4 freshly updated,
Apr 4 10:01:26 dell01 org.gnome.Nautilus[819]: /home/user1/softs/safe-browser-v0.10.1-linux-x64/safe-browser: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory
install libgconf-2-4 thru synaptic solves the problem
but I signal it.