Secure Firefox for Guest Users

I want to secure Firefox for guest users on my computers. I don't often have guest users but when I do I would like to have firefox be as secure as possible without the user being able to change firefox's settings, at least as much as possible. I would also like to have firefox be as lean as possible for the guest user so I would only like the bare minimum of add-ons or whatever other settings in Firefox I need to change to make it secure from malware, phishing, etc. I don't mind a million add-ons for myself but for a guest user I only want what I need for minimum add-ons but maximum security.

I plan to put Firefox in a sandbox (SafeSpace in my case) but just in case the guest user tries to disable the sandbox I would like to make sure Firefox is still relatively secure. I still have resident anti-virus and resident anti-spyware and a firewall for all users. And, of course, all guest users have limited accounts.

Any suggestions on how to do this? Keep in mind, I only have a middle level computer knowledge.

Thanks in advance. Lionman

 

You could set the pc to boot into Returnil mode without any desktop icons or prompts showing.

Your other security seems quite good as is though.

 

You might find the Public Fox extension useful. I use it on the PCs at work to keep users from changing settings and downloading specified file types. It's probably not unhackable but it's not too bad either.
https://addons.mozilla.org/en-US/firefox/addon/3911