I use Ubuntu 12.04 and Firefox 15.0.1 I have some history saved in my Firefox browser. I find it useful to have them. But I don't want my friends or anyone to have a look at my history when they borrow my laptop. So I want to put a password to Firefox, i.e., when someone opens Firefox, they should be prompted for a password.
How do I do this?
EDIT: No, not a guest account. I want to know how it can be done like I asked. (I wouldn't want to logout and re-login with the guest account and give it to my friend, Besides file privileges are totally different in guest accounts. I want my friends to have normal file privileges :) .)