The biometric unlock option is being gradually rolled out. It will be available on Firefox as well, but we're taking our time to deploy it progressively since the feature is tricky. Make sure to keep your browser and the Proton Pass extension up-to-date for any improvements.

On another note, we're constantly working on improving the autofill and autosave for all websites reported by our community. That said, feel free to flag any problematic websites to us at https://proton.me/support/contact so we can note your feedback for future improvement.