[K12OSN] "Locking Down" user preferences

[Ryan Hackl]

G'day, all!
 
I've got K12LTSP working with thin clients in classrooms throughout the school.  Students user settings are modified at log in (via a script) so that when they log in, their homepage and proxy settings are set to access the web via our dansguardian/squid server.
 
Trouble is, students who have found where this setting is are able to change the proxy setting for their current log in, and this isn't so good.  
 
I know in Windows (2003, which we also have running in the school), there is a "Group Policy Object" that allows the administrator to "lock out" users from the 'Internet Properties' setting in IE.
 
Is there such a resource for K12LTSP, so I can lock-out, or "hide" the "Preferences" control panel in Firefox?
 
Thanks for any suggestions!
 
- Ryan Hackl
Spiritwood High School
 
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