I did roughly the same thing twelve years ago, with even less security built in (hey, I was young(er)): https://bookmarklets.arantius.com/password+maker+bookma

I did roughly the same thing twelve years ago, with even less security built in (hey, I was young(er)): https://bookmarklets.arantius.com/password+maker+bookmarklet https://bookmarklets.arantius.com/password+maker+bookmarklet I did not market it so heavily. It has the same problems, most importantly rotation. As soon as you want to rotate one site's password the only option is to change the "master" password, but now you need to remember which site uses which master password, and your utility is gone. The random site requirements, as mentioned, is also a big deal.