gnome-help-browser should _not_ be used to view arbitrary
HTML documents. May I repeat _not_. (Nautilus is
the normal GNOME help browser, but doesn't make
sense for arbitrary files.)
Mozilla is a fine web browser to use under GNOME.
Also, /sbin/pidof gnome-session is a really silly way
to detect if you are running under GNOME. Checking
whether the GNOME_SESSION_NAME environment variable
set would be more reliable.
Fixed in 2.0.0