Features I need:
* Cross-platform (iOS, macOS, Windows)
* Easy to use browser plugins (the LastPass safari plugin is awful and non-discoverable via Safari plugin search)
* Autofill in browsers (Safari and Firefox) and mobile (iOS)
* Internet-based sync (I don't really want to manage my own backend)
Nice to haves:
* Account creation detection
* TOTP
* Yubikey support
* XKCD-style password generation for passwords I want a shot at remembering