I think that it could be very useful and add security an option to lock the vault if the PC is not connected to a specific WiFi network for a certain amount of time.
In particular the FireFox extension.
For example, if a laptop gets stolen and the vault is unlocked, it’s a disaster. And you may say: you must have a password on your laptop! I do, but go tell it to my mother! 
And, buy the way, I use fingerprint to loin to my laptop, but I know that it’s pretty easy to find a fingerprint on a laptop surface (physical surface, not the Microsoft product 
) and use it.
I think we also need the same think in mobile app