If you are using Chrome and haven’t signed out of the browser, and you share your computer or your computer is stolen, then you have shared any passwords you have saved in the browser. Anyone can simply go to chrome://settings/passwords to view the passwords you have saved. There is no other security applied.
Unlike Firefox. You can set a master password that you have to enter before you can see the saved password. This adds a layer in Firefox’s security.
IE encrypts passwords and you can’t easily view them. You can download IE Passview to see them.
The bottom line is, if you share a computer or travel with your laptop, make sure you are logged out of all your browsers and logged out of the operating system. Make sure all user accounts are password protected.