Lock 4 Me is an awesome app for Mac, that can protect your privacy in other apps that don't have password protection.
Lock for Me will only be triggered after an app is quit completely(Command + Q), then reopened. If you click 'close' button on the left top corner, that will only close the window, the app isn't quit. If you open the app after that, Lock for Me will not be triggered.
Surf, shop and social network knowing that you, your identity, and your personal information are always safe.