I have thought about that... but more and more, I browse the internet from some sort of closed system (iOS and Android devices). I also switch operating systems

I have thought about that... but more and more, I browse the internet from some sort of closed system (iOS and Android devices). I also switch operating systems quite often. I doubt any solution, other than "just remember the damned password, you remember N of them, so you can remember N+1, right?" will work vertically on all of those.