I'd like to control the use of Safari

Is there an add on that can put a lock (like the one used in the rest of the OS) so that access to the internet via safari is shut off or controlled?
I know I can set this up in parental controls, but that either blocks its use completely or restricts it to certain sites.
I'd like to be able to leave the classroom knowing that people can come in and use applications, including internet-linked widgets, but have Safari only access sites in the bookmarks bar (plus one link deep, say - we have a filter anyway). If I could unlock it by entering a password and then lock it again just by clicking (or have it auto lock after a set time) that would be ideal.
Any thoughts?

Take a look at [https://addons.mozilla.org/en-US/firefox/search/?q=Session&cat=all&lver=any&pid=1&sort=&pp=20&lup=&advanced= these extensions at AMO] for those features.

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