When enabled, you must enter the master password the first time you use a saved password, once per browser session. (pcworld.com)
In the end, VPN is another tool you can use to ensure that, when it's appropriate (you're accessing confidential or private information) and necessary (you're not using a secure connection, whether wired or through an encrypted Web browser session). (slaw.ca)
Additionally, Apple has now required under section 11.13 of the App Store developer agreement that «Buy» buttons that spawn external browser sessions in content consumption apps are no longer permitted and will be rejected. (zdnet.com)