I am not sure I understand what you are asking.

There are methods of, at least to a certain extent, locking down Firefox. However you may also then need to lock down the device itself to prevent for instance installation or use of an alternative browser (or even another OS! ).

If a desktop device is secured, the user will quite possibly just use another device, a mobile, or an internet cafe etc. Mobile devices tend to be used by a single user.

If you are concerned about users viewing your site images then why not require login and authentication of users?

I guess I wasn't clear enough in my first post. I was attempting not to ramble. Here's the situation. I'm a volunteer at a GLBT community center in a major metro. area. We have a cyber-center with 10 computers in it that is available for use by the community. We serve all kinds of people including young adults and adults. We're having a problem with some of the adults using the computers to look at the dating adds on Craig's list. There are some pretty graphic images on those sites that we don't want the younger cyber-center users to see. But Craig's list is also a good resource for jobs and housing. I've found the way to block the pictures on Craig's list, but if the person is computer literate then they can easily switch it back. I would like to know if there is a way to make it so you can only make those changes with administration rights.

I'm pretty sure there is a way that we can set the computers to only use Firefox for the browser. I want to find out for sure before taking the time to see if there is a way to lock out Internet Explorer. 

I hope this makes more sense.

I want to find out for sure before taking the time to see if there is a way to lock out Internet Explorer. I do not use Windows much these days, but I imagine it is relatively trivial to remove access to IE for any particular limited account. However the computer is likely to need IE so do not remove it entirely.

I am not sure you will necessarily achieve your objective by merely locking Firefox preferences, but that seems to be what you are asking and may be done, see:

• http://kb.mozillazine.org/Locking_preferences

Possibly an option is to have separate computer OS accounts for youngsters and adults. It would then be possible to use firewall settings etc to block certain sites for one set of accounts.

You may find using a network, possibly with Firefox ESR would help. That would allow individual user accounts for each person. That is not something I am knowledgeable about, but you could look for advice on the mailing list

• https://mail.mozilla.org/listinfo/enterprise
• for ESR http://www.mozilla.org/en-US/firefox/organizations/

It looks like we're getting closer to an answer. It's not really possible to set up everyone with their own account and setting up separate profiles for adults and young adults is also not going to work, because there are still times when both are in the room. I was able to set Internet Explorer to only run in administrator mode by setting some properties on the shortcuts. Unfortunately that didn't work if I navigated to the programs folder in windows and clicked on the startup exe file. I don't have the correct software on my machine to test setting up permissions so I'm going to install a virtual copy and do some testing that way. It may be a few days before I get back to you, but I appreciate the help so far.

I think I found a way to block the personals section on the website using the url and keywords. I'll just have to check and see if the routers or managed switches can be configured correctly. I'm going to mark this thread solved for now. Thank you for your help.

Good luck, thanks for posting back.