Comment 4 for bug 290507

Admittedly this is a very contrived argument. With the same logic, you could also forbid Alice to write _any_ file at all, or even better, disallow everyone to create file, since they might otherwise upload them to a public website or borrow their computer to other people.

If you carelessly leave private stuff on other computers, this is an entirely social problem, I don't think that there's a good technical answer for this. Firefox even asks you whether it stores the password. No sane person would give their credit card to a random stranger on the street and then walk away. If people do the same with computers, then we have an education problem, not a guest session bug. :-)

Alex, is it even possible to do that, such as providing some firefox default settings in guest's firefox profile? If that is too hard, nevermind.