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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.

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    I'm not sure is there a way to do this and you would still need to close the browser. Is there any reason not to lock your computer before you leave? Windows + L on PC, Control + Shift + Eject/Power for Mac... On some laptops there is a dedicated lock key (ThinkPads that I use have it). – Enis P. Aginić Apr 25 '14 at 7:39
  • @EnisP.Aginić but what if an administrator logs into my account? – Erel Segal-Halevi Apr 27 '14 at 4:41
  • A simple way would be to uncheck "keep me logged in" on websites. So whenever you close browser, you would be automatically logged off. Without Master Password, Others would not get password auto filled. – Abhinav Kulshreshtha Apr 27 '14 at 4:53
  • On Firefox, You could also try extensions startupMaster or MasterPassword . – Abhinav Kulshreshtha Apr 27 '14 at 4:56
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    Unfortunately, these extensions would do you no good if the user opened the browsers in safe mode. chrome.exe --disable-extensions for Chromium and firefox.exe -safe-mode in Firefox. – Chirag Bhatia - chirag64 Apr 27 '14 at 5:20
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Firefox

You can use the StartupMaster addon.

Asks for the master password at startup (fixes multiple password prompt)

enter image description here

Chrome

For chrome you can use Simple Startup Password

enter image description here

  • both extensions have now been removed – Abdul Rauf Mar 20 at 4:51

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