Password protect google chrome

Depending on your system you could encrypt your Chrome Profile Folder (TrueCrypt in Windows, equivalent ones on other operating systems)

Before starting chrome, you mount your encrypted archive, then use

chrome.exe --user-data-dir="<location to profile>"

to start the browser using that directory.

P.S.: You can put a specific link on your desktop with the parameter for the profile location, so others can use chrome with the default profile.

One more useful tool very similar to Truecrypt - Rohos Mini Drive. I'm using it's feature - Hide folder to password protect my Google Chrome profile - http://www.rohos.com/2010/12/how-to-password-protect-google-chrome-data-with-rohos-encryption-software/