Love the Firefox password manager, but Proton Pass' capacity to be used everywhere, and slew of more robust features made the switch a tough, but ultimately positive change.
I love in particular passkeys, separate email/username fields, adding notes to fields, naming accounts, separating personal/work/alias/projects "vaults", one click alias generation, tweakable random password generation and auto-saves, pop-ups instead of new tab, and auto-timeout security. I got it in tandem with moving my emails to Proton Mail, and upgraded to get full features; I'll never be without Proton from now on.