And where is stored this master password then? If it's on your browser/computer, it's not portable. If it's online, it's possibly less secure (especially if you

And where is stored this master password then? If it's on your browser/computer, it's not portable. If it's online, it's possibly less secure (especially if you're not the one hosting it). A physical token might work, but it's usually too specific and not scalable. Nothing beats plain old password as convenience, that's why they are still so wildly used despite lousy security properties.