This
link says to use an OS called 'Tails', and that Tails includes a password manager called KeePassX.
At this
link, it says KeePassX is compatible with Mac OS X, and Windows 2000, XP, Vista and 7, as well as Linux.
However, at this
link, it says autotype is currently supported on Linux only; I presume 'autotype' means 'autofill'?
BTW, my main problem with OSs like Tails is that they don't allow you do easily modify them to change the browser background color to an off-white; and pure white background color burns my eyes out; which is why I use DimScreen as a stop-gap measure; but I prefer to change background color to something like 'light gray' which saves enormous eye strain.
IOW, Tails would be great if I could set it up to always run with light gray background in browser, and also if I could get it to play youtube and other vids.
That's a gripe for TOR Vidalia's built-in modified Firefox browser; it won't play youtube and refuses to be modified to do so.