[K12OSN] Change globaly Firefox Home page

[M.Pribik]

Hello
is it possible to set up centrally for all users default web home page? I supposed that I could find
it somewhere in /usr/lib/firefox-1.5/greprefs/all.js,  but I can not find the proper place. Current default 
Web home page is www.google.com. 
Can somebody guide me how to change it to another?
Thank you.
Marian.
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