It'd be ideal if browsers offered standard hooks into their password-filling mechanisms. Let the password managers volunteer "I know a password for this site!" and fill it through the browser's standard UI.

Basically, I want the browsers to implement something close to what Apple has for password management on iOS. Ideally go a bit further and expose hooks for creating/saving a new login, too.

Unless they already do this, and nobody has actually taken them up on using it?