RE: SteemLogin - a new and easy way to sign in to Steem!
Anything storing your chain passwords is a potential risk of losing everything. If you're going to trust someone to store your data it should be yourself or your browser.
There are two trusted methods right now, steem keychain handshake.
The other method is to compare your private key to public key and on confirmation create a session, then store the posting key in the browser encrypted.