I know that firefoxadm works for old versions of Firefox but it does not for the latest versions. what are people using now, how do you configure for newer versions of firefox?
You might be interested in Frontmotion's Firefox package which includes GPO templates. We've just today updated to the latest version of Firefox using this, and everything appears to be working fine.
Also, consider using the Autoconfig feature that is built into Firefox if you need something that's more flexible (at the expense of complexity of course).