Why?

Using the same password for multiple accounts is very unsafe. If one of those sites gets compromisedit will affect all your accounts, possibly even leading to identity theft. The idea behind this proyect it that you memorise just one, reasonably long, secure master password and use it to generate non-dictionary complex passwords. This password generator works using JavaScript and the SHA-256 implementation extracted from digitalbazaar/forge, entirely within the page and no data is ever passed back to the server.