Startup Script for Firefox

[Alfred Vahau]

I have customized the Ubuntu-installed Firefox browser for browsing our 
online Library Catalogue.
 I now want to put it in a start up script so that after a user logs in 
from the desktop, Firefox is automatically
fired up displaying the page for the Online catalog. I want to 
experiment with the script
and find the right run level to place it under but being new to Ubuntu 
(2 weeks now), I would appreciate some pointers in where I may look.

Alfred,