In my work computer, I like to stay logged into my email accounts, Facebook etc.
However, I am concerned that someone might get into my computer when I am away (e.g. an administrator can log into my computer even if I lock or logout), open a web browser, and thus access to my email and Facebook without even having to know my passwords.
Is there a way to add a startup password to browsers (particularly Firefox and Chromium), such that this simple hack will not be possible?
In Firefox there is "Master Password", but it seems to protect only the passwords saved within Firefox, e.g., if a hacker tries to login from Firefox to my email account, he will not have Firefox automatically fill the password. But, if I am already logged in to my email account in Firefox, it doesn't even ask for my password so this doesn't help.