So you are looking for a secure way to store your passwords offline? The Mooltipass Mini can help. It is a tiny offline password keeper that can be shared among multiple users. It connects to any USB capable device and unlocks your credentials with a smartcard and pin.
You can use this with Chrome, Firefox, and Safari. A smartcard works with multiple Mooltipass Minis. The device is completely open source. You will need to remember one pin to access all your accounts.