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Another usability problem is that every browser has its own password manager, and every vendor pushes their own thing.
Apple locked out competing browsers from Safari's keychain, so all browsers created their own keychains. Apple tried to remedy the fragmentation they caused by offering a browser extension, but that creates a DIY duplicate autofill UI that fights the other autofill UIs.
Where are the passwords? Where are they saved to? Who knows!?! Depends on JS events and z-index.